Heat is the transfer of energy from a hot body to a cold body. Temperature is measured using a thermometer, with common units being Celsius, Fahrenheit and Kelvin. Thermometers contain mercury which expands and contracts with temperature changes, allowing accurate readings. Different types of thermometers are used for clinical, laboratory, and weather applications. Heat is transferred through conduction, convection and radiation. Conduction involves direct contact, convection involves fluid movement, and radiation does not require a medium. Materials can be conductors or insulators of heat transfer.
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Chapter 4 - Heat, Science, Class 7
HEAT
HOT AND COLD
THERMOMETER
CLINICAL THERMOMETER
HOW TO USE CLINICAL THERMOMETER?
WHILE USING CLINICAL THERMOMETER, THE FOLLOWING PRECAUTIONS SHOULD BE TAKEN
LABORATORY THERMOMETER
WHILE USING LABORATORY THERMOMETER, THE FOLLOWING PRECAUTIONS SHOULD BE TAKEN
DIGITAL THERMOMETER
TRANSFER OF HEAT
CONDUCTION
CONDUCTORS
INSULATORS
CONVECTION
RADIATION
SEA BREEZE
LAND BREEZE
CLOTHES IN WINTERS AND SUMMERS
HOW DO WOOLLEN CLOTHS KEEP US WARM?
Every topic of this chapter is well written concisely and visuals will help you in understanding and imagining the practicality of all the topics.
By Shivam Parmar (Entrepreneur & Teacher)
HEAT
TEMPERATURE
LAND BREEZE
EFFECT OF HEAT
MEASUREMENT OF TEMPERATURE
CLINICAL THERMOMETERS
DIGITAL THERMOMETERS
SEA BREEZE
TRANSFER OF HEAT
CONDUCTION
CONVECTION
CONDUCTORS AND INSULATORS
RADIATION
DARK COLOURED SURFACES AND COLOURED SURFACES
WIND
I have expertise in making educational and other PPTs. Email me for more PPTs at a very reasonable price that perfectly fits in your budget.
Email: parmarshivam105@gmail.com
Chapter 4 - Heat, Science, Class 7
HEAT
HOT AND COLD
THERMOMETER
CLINICAL THERMOMETER
HOW TO USE CLINICAL THERMOMETER?
WHILE USING CLINICAL THERMOMETER, THE FOLLOWING PRECAUTIONS SHOULD BE TAKEN
LABORATORY THERMOMETER
WHILE USING LABORATORY THERMOMETER, THE FOLLOWING PRECAUTIONS SHOULD BE TAKEN
DIGITAL THERMOMETER
TRANSFER OF HEAT
CONDUCTION
CONDUCTORS
INSULATORS
CONVECTION
RADIATION
SEA BREEZE
LAND BREEZE
CLOTHES IN WINTERS AND SUMMERS
HOW DO WOOLLEN CLOTHS KEEP US WARM?
Every topic of this chapter is well written concisely and visuals will help you in understanding and imagining the practicality of all the topics.
By Shivam Parmar (Entrepreneur & Teacher)
HEAT
TEMPERATURE
LAND BREEZE
EFFECT OF HEAT
MEASUREMENT OF TEMPERATURE
CLINICAL THERMOMETERS
DIGITAL THERMOMETERS
SEA BREEZE
TRANSFER OF HEAT
CONDUCTION
CONVECTION
CONDUCTORS AND INSULATORS
RADIATION
DARK COLOURED SURFACES AND COLOURED SURFACES
WIND
introduction to heat.
equalities of heat
hot and cold objects
Temperature
table-temp. and heat
heat fixed points
temperature scales
thermometers-making,intro.,types,
conversation of scales
Hd Pictures
This Drawing Competition was a hit show grabbing the attention of 5K people with a participation of 17 schools, like
Lord Jesus Public School, Our Lady of Fatima Convent School,
DPS, DAV, to name a few!
The excitement was reflected from their faces, and the proud
parents were so happy to see the artwork of their talented minds.
On this unforgettable occasion of Gandhi Jayanti, Let's spare our few minutes for a great leader and freedom fighter of India.
It wouldn't have been possible without him. A big big thankyou from all of you for him.
National development refers to the ability of a nation to improve the lives of its citizens. Measures of improvement may be material, such as an increase in the gross domestic product, or social, such as literacy rates and availability of healthcare.
Nutraceutical market, scope and growth: Herbal drug technologyLokesh Patil
As consumer awareness of health and wellness rises, the nutraceutical market—which includes goods like functional meals, drinks, and dietary supplements that provide health advantages beyond basic nutrition—is growing significantly. As healthcare expenses rise, the population ages, and people want natural and preventative health solutions more and more, this industry is increasing quickly. Further driving market expansion are product formulation innovations and the use of cutting-edge technology for customized nutrition. With its worldwide reach, the nutraceutical industry is expected to keep growing and provide significant chances for research and investment in a number of categories, including vitamins, minerals, probiotics, and herbal supplements.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
Cancer cell metabolism: special Reference to Lactate PathwayAADYARAJPANDEY1
Normal Cell Metabolism:
Cellular respiration describes the series of steps that cells use to break down sugar and other chemicals to get the energy we need to function.
Energy is stored in the bonds of glucose and when glucose is broken down, much of that energy is released.
Cell utilize energy in the form of ATP.
The first step of respiration is called glycolysis. In a series of steps, glycolysis breaks glucose into two smaller molecules - a chemical called pyruvate. A small amount of ATP is formed during this process.
Most healthy cells continue the breakdown in a second process, called the Kreb's cycle. The Kreb's cycle allows cells to “burn” the pyruvates made in glycolysis to get more ATP.
The last step in the breakdown of glucose is called oxidative phosphorylation (Ox-Phos).
It takes place in specialized cell structures called mitochondria. This process produces a large amount of ATP. Importantly, cells need oxygen to complete oxidative phosphorylation.
If a cell completes only glycolysis, only 2 molecules of ATP are made per glucose. However, if the cell completes the entire respiration process (glycolysis - Kreb's - oxidative phosphorylation), about 36 molecules of ATP are created, giving it much more energy to use.
IN CANCER CELL:
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
introduction to WARBERG PHENOMENA:
WARBURG EFFECT Usually, cancer cells are highly glycolytic (glucose addiction) and take up more glucose than do normal cells from outside.
Otto Heinrich Warburg (; 8 October 1883 – 1 August 1970) In 1931 was awarded the Nobel Prize in Physiology for his "discovery of the nature and mode of action of the respiratory enzyme.
WARNBURG EFFECT : cancer cells under aerobic (well-oxygenated) conditions to metabolize glucose to lactate (aerobic glycolysis) is known as the Warburg effect. Warburg made the observation that tumor slices consume glucose and secrete lactate at a higher rate than normal tissues.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
Nucleic Acid-its structural and functional complexity.
Heat
1. VIDYA BHARTI EDUCATIONAL INSTITUTIONS
SCIENCE NOTES CLASS 7TH
HEAT
Introduction
Heat is the transfer of energy from a hot body. The sense of touch can be used to
understand the degree of hotness or coldness of something. But the sense of touch is
not reliable and cannot be always used to say how much hot anything is. Moreover,
using the sense of touch can be risky in case of something very hot. Thus, hotness of
anything is measured in terms of TEMPERATURE in reliable way. To measure
temperature a device called THERMOMETER is used.
Unit of heat:There are three units which are used to measure the temperature: Degree
Celsius, Fahrenheit and Kelvin.
Degree Celsius: Degree Celsius is written as °C and read as degree Celsius or simply
Celsius. For example 20°C; it is read as twenty degree Celsius.
Fahrenheit: Fahrenheit is written as °F and read as degree Fahrenheit. For example
25°F; it is read as twenty five degree Fahrenheit.
Kelvin: Kelvin is written as K. For example 100K; it is read as hundred Kelvin.
Thermometer: Thermometer is a device which is used to measure temperature.
Thermometer is made of a long narrow glass tube; with a bulb at one end. The narrow
tube appears as a continuous silver line; because it is filled with mercury. Mercury is a
metal which is in liquid state at room temperature and it readily expands or contracts at
the slightest change in temperature. Hence, mercury is used in thermometer.
Types of thermometer
Laboratory Thermometer: Laboratory thermometer is used to measure the
temperature. The scale of temperature is graduated generally from –10°C to 110°C over
the glass tube. Each division of temperature scale is further divided into 10 parts to read
fraction of temperature.
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2. VIDYA BHARTI EDUCATIONAL INSTITUTIONS
SCIENCE NOTES CLASS 7TH
HEAT
Clinical Thermometer: Clinical thermometer is used to measure the body temperature.
The scale of temperature is graduated from 35°C to 42°C and or from 94°F to 108°F.
The temperature of human body always remains within this range and this is the range
on the clinical thermometer. There is a kink make near the bulb of clinical thermometer
which prevents the automatic fall of mercury level.
Digital Thermometer: In digital thermometer, reading of temperature is displayed
digitally as in digital watches. This is safer because no mercury is used in this. It is
important to note that mercury is a highly toxic substance.
Maximum-Minimum Thermometer: Maximum – minimum thermometer is used to
measure the daily temperature to prepare weather reports.
Reading of thermometer and measuring of temperature
Take a clinical thermometer and hold it horizontally with reading scale towards your eye.
Do not hold the thermometer from the bulb.
Rotate the thermometer slightly clockwise and anticlockwise. By doing this you will see
a shiny thin silvery thread. The end of the silvery thread shows the reading of
temperature. If mercury lining ends at 37, the reading is 37°C.Wash the bulb end of
thermometer with an antiseptic solution.
Give two or three jerks slightly. By doing this the mercury level would fall. When it falls to
35°C or below, put it below the tongue and wait for one minute. Take out the
thermometer and read the temperature. Temperature would be near 37°C.The normal
body temperature is 37°C. This can differ from person to person.
Use of Laboratory Thermometer
Take some water in a beaker. Take a laboratory thermometer and immerse its bulb end
in water; holding it vertically. Ensure to dip whole portion of bulb end. The bulb end
should not touch the bottom or side of the beaker. Observe the movement of rise of
mercury. When it becomes stable, take the reading of the thermometer.
Repeat this with hot water and take the reading.
Difference between clinical and laboratory thermometer
Clinical Thermometer Laboratory Thermometer
Clinical thermometer is scaled from 35°C
to 42°C or from 94°F to 108°F
Laboratory thermometer is generally
scaled from -10°C to 110°C
Mercury level does not fall on its own, as
there is a kink near the bulb to prevent the
fall of mercury
Mercury level falls on its own, as no kink is
present
Temperature can be read after removing
the thermometer from the armpit or mouth
Temperature is read while keeping the
thermometer in the source, such as liquid
or anything.
CONTACT: 9654089891, 9811083910, 9953898004
HEAD OFFICE: 131/12 KRISHNA COLONY, STREET NO 4, NEAR SHIV MANDIR, GURGAON
3. VIDYA BHARTI EDUCATIONAL INSTITUTIONS
SCIENCE NOTES CLASS 7TH
HEAT
To lower the mercury level jerks are given No need to give the jerks to lower the
mercury level
It is used to take the body temperature It is used to take the temperature in
laboratory
Transfer of heat:
Heat is transferred by conduction, convection and radiation.
Conduction:
Transfer of heat from one particle to the adjacent particle is known as conduction of
heat. In solids, heat is transferred by the process of conduction. In this process, the
transfer of heat takes place through adjacent molecules.
Example: When one end of an iron rod is put over flame then part which is nearer to
the flame is heated first and heat is gradually transferred to the other end of the rod.
This happens because particles of iron rod which are nearer to the flame receive the
heat and transfers this to the adjacent particles. Subsequently, the adjacent particles
transfer the heat to the next adjacent particles. This process continues and heat
reaches to the other end of the rod. Thus, heat transfer in solid takes place through
conduction.
Conductor and Insulator
Materials which allow heat to pass through it are called conductor or good conductor of
heat, such as iron, copper, aluminium, etc. All metals are good conductors of heat.
Since, mercury is a metal and found in liquid state at room temperature, that’s why it is
used in thermometer.
Since metals are the good conductor of heat that’s why kitchen utensils are made of
metals or alloys of metals.
Materials which do not allow heat to pass through them are called bad conductor or
poor conductor of heat. They are also called insulators. Example: rubber, wood, plastic,
etc. This is the cause that handles of frying pan or other kitchen utensils are made of
plastic.
Convection:The transfer of heat because of movement of the molecules of the
medium; via mass transfer; is called convection or convection of heat.
Water and air are bad conductors of heat. But they do become hot, in spite of being bad
conductors. Heat transfer in fluids takes place through convection.
CONTACT: 9654089891, 9811083910, 9953898004
HEAD OFFICE: 131/12 KRISHNA COLONY, STREET NO 4, NEAR SHIV MANDIR, GURGAON
4. VIDYA BHARTI EDUCATIONAL INSTITUTIONS
SCIENCE NOTES CLASS 7TH
HEAT
Convection in water: When water is heated in a pan, the particles of water which are
near the source of heat; get heated first. Because of heating, they become light; and
rise in water. The gap which is created because of rise of hot particles is filled cold
particles of water from the surrounding area. Thus a cyclical movement of particles
begins and ends up heating the whole water of the pan. The cyclical movement in fluids
because of heating is called convection current.
Convection in air: Air gets heated because of convection; the way water gets heated.
Air near the source of heat gets heated and rises above. This leaves a gap; which is
filled by the colder air from the surrounding. The convection current thus starts in air
which results in heating up of air.
When you place your palm above a flame you will feel the hotness of the flame. But
when you will place your palm below the flame the area will be colder. This shows how
the colder air from below moves up; due to convection current.
Land and Sea Breeze
Sea Breeze: In coastal areas, the breeze that moves from sea surface to the land is
called sea breeze. This happens because, during daytime, land gets heated more
quickly than water. As a result, warm air from land rises up; leaving a gap. To fill that
gap, colder air from the ocean surface rushes towards the land. This phenomenon
continues and a continuous flow of cold air keeps coming towards the land. This gives
rise to the phenomenon which is called the sea breeze. Because of this, people living in
coastal areas prefer to live in a sea facing house.
Land Breeze: In coastal areas, the breeze which moves from land towards the sea is
called land breeze. In the night, the land cools down more quickly than the ocean
surface. This makes the air over the water surface warmer than air over the land
surface. Warmer air over the water surface rises in the air and air from the land rushes
towards the water surface to fill the gap. This phenomenon continues which creates a
flow of air from land to the sea. This phenomenon is called land breeze.
CONTACT: 9654089891, 9811083910, 9953898004
HEAD OFFICE: 131/12 KRISHNA COLONY, STREET NO 4, NEAR SHIV MANDIR, GURGAON
5. VIDYA BHARTI EDUCATIONAL INSTITUTIONS
SCIENCE NOTES CLASS 7TH
HEAT
Radiation: All hot bodies emit heat by the process of radiation. Radiation of heat does
not require a medium. Sunlight comes to the earth because of radiation as there is no
medium present between the atmosphere of the earth and the sun.
One can feel the heat of bonfire by standing around it. We get warmth from the room
heater because of radiation.
Reflection and absorption of heat: When heat falls over an object some of the heat is
absorbed by the body and some of the heat is reflected. The temperature of an object
increases because of absorption of heat.In conventional room heater you can see the
reflector attached with it. The reflector of the room heater reflects the heat towards the
person sitting or standing near the room heater.
Reflection is the cause that umbrella is used to protect from heat of the sun in summer.
Dark color absorbs more heat while light color reflects most of the heat. That’s why
wearing light colored clothes is preferred in summer, dark colored clothes are preferred
in winter.
Dark clothes absorb more heat and keep one comfortable in winter. On the other hand,
light clothes reflect most of the heat and keep one comfortable in summer.
Now-a-days many kitchen utensils come in black color, since utensils of black color
absorb more heat and thus cooking becomes faster.
Woolen Cloth: Woolen clothes are used in winter season. Wool is a poor conductor of
heat. In addition to it; air gets trapped in woolen fiber to further increase the poor
conductivity of wool. This prevents the radiation of heat of our body to the surrounding
and prevents the cold from surrounding to affect our body. Thus, wearing woolen cloth
makes one comfortable in winter season.
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HEAD OFFICE: 131/12 KRISHNA COLONY, STREET NO 4, NEAR SHIV MANDIR, GURGAON