This document discusses different thermal processes involving changes of state:
- Boiling occurs when a liquid absorbs thermal energy and changes to a gas at a constant temperature, breaking molecular bonds. Condensation is the reverse process where a gas releases thermal energy forming liquid bonds.
- Melting absorbs thermal energy at a constant temperature to break solid bonds into liquid. Solidification releases energy forming new solid bonds.
- Evaporation differs from boiling in occurring at any temperature as more energetic molecules overcome surface forces, cooling the remaining liquid. Factors like temperature, pressure and airflow affect evaporation rates.
Refrigeration is a technique used for preserving food in low temperatures. This procedure slow down or stop most bacteria from dividing and thereby multiplying, but do not kill them.
Refrigeration is a technique used for preserving food in low temperatures. This procedure slow down or stop most bacteria from dividing and thereby multiplying, but do not kill them.
Unit operation in Food Processing. Preliminary Unit operation
Cleaning, sorting & Grading - aims, methods and applications
2. Size Reduction and Sieve Analysis
Theory of comminution; Calculation of energy required during size reduction. Crushing efficiency; Size reduction equipment; Size reduction of fibrous, dry and liquid foods; effects of size reduction on sensory characteristics and nutritive value of food
Sieving: Separation based on size (mesh size); types of screens; effectiveness of screens
3. Mixing
Mixing, Agitating, kneading, blending, homogenization and related equipment
4. Separation Processes
Principles of Filtration, Sedimentation, Crystallization and Distillation and equipment used
This PPT about the individual quick freezing of herbs which is semi automated process. gives an idea about IQF and how the freezing of herbs done and their specification
Size reduction is a process of reducing large solid unit masses into small unit masses, coarse particles or fine particles.
Size reduction process is also termed as
Comminution/Diminution/Pulverizations.
Solid pieces of food is reduced by the
application of grinding, compression
or impact forces.
In many food processes it is frequently
necessary to reduce the size of solid
materials for different purposes
Freezing helps to Inhibit the growth of microorganisms hence help in preservation of foods. So, freezing is a very easy and effective method for the preservation of fruits and vegetables and to retain them for longer duration.
Dehydration
food dehydration
preservation effect
controlling factors for dehydration
factors affecting dehydration
driers commonly used are
dehydration and nutritive value
disadvantage
drying and microbes
Unit operation in Food Processing. Preliminary Unit operation
Cleaning, sorting & Grading - aims, methods and applications
2. Size Reduction and Sieve Analysis
Theory of comminution; Calculation of energy required during size reduction. Crushing efficiency; Size reduction equipment; Size reduction of fibrous, dry and liquid foods; effects of size reduction on sensory characteristics and nutritive value of food
Sieving: Separation based on size (mesh size); types of screens; effectiveness of screens
3. Mixing
Mixing, Agitating, kneading, blending, homogenization and related equipment
4. Separation Processes
Principles of Filtration, Sedimentation, Crystallization and Distillation and equipment used
This PPT about the individual quick freezing of herbs which is semi automated process. gives an idea about IQF and how the freezing of herbs done and their specification
Size reduction is a process of reducing large solid unit masses into small unit masses, coarse particles or fine particles.
Size reduction process is also termed as
Comminution/Diminution/Pulverizations.
Solid pieces of food is reduced by the
application of grinding, compression
or impact forces.
In many food processes it is frequently
necessary to reduce the size of solid
materials for different purposes
Freezing helps to Inhibit the growth of microorganisms hence help in preservation of foods. So, freezing is a very easy and effective method for the preservation of fruits and vegetables and to retain them for longer duration.
Dehydration
food dehydration
preservation effect
controlling factors for dehydration
factors affecting dehydration
driers commonly used are
dehydration and nutritive value
disadvantage
drying and microbes
Notes 2: Phase Change
• Phase change is a change from one state of matter (solid, liquid, gas) to another.
• Phase changes are physical changes because it only affects physical appearance, not chemical make-up and its reversible
• Water exists on our planet in three states: Ice, water, and water vapor
• Water is different from other substances because it is less dense as a solid than liquid
• When temperature changes, molecules speed up/slow down resulting in a change in the average kinetic energy of molecules.
• During a phase change, heat energy is either absorbed or released. Heat energy is released as molecules move closer together. Heat energy is absorbed as molecules move farther apart.
• During phase changes, temperature does not change. Molecules move closer together or farther apart, resulting in a change in the potential energy of the molecules.
• Types of phase changes: Melting, freezing, vaporization, condensation, sublimation, deposition
• Melting - Phase change from a solid to a liquid
• Freezing- Phase Change from a liquid to a solid
• Vaporization - Phase change from a solid or liquid to gas. It occurs at the boiling point of matter or sublimation process. (Water - 100° C, Table salt - 1413° C, Diamond - 4200° C)
• Evaporation-type of vaporization in which a liquid turns to a gas on the surface of a liquid (occurs at all temperatures).
• Evaporation- a Cooling Process. As water in the perspiration evaporates from your skin it absorbs and carries away heat energy from your body.
• Condensation - Phase change from a gas to a liquid.
• Water vapor in surrounding air loses heat energy when it comes in contact with the cold glass. Water vapor condenses and becomes liquid drops of water.
• Sublimation - Phase change from a solid to a gas.
• Deposition - Phase change from a gas to a solid.
• Boiling Point - The temperature at which a liquid changes into a gas. 212 F or 100 C
• Melting Point - The temperature at which a solid changes into a liquid. 32 F or 0 C
• Freezing point - The temperature at which a liquid changes into a solid. 32 F or 0 C
• Freezing point and melting point of a substance are the same temperature.
Matter- Matter is anything which occupies space and has mass is called matter. Air and water, sugar and sand, hydrogen and oxygen etc. Matter is made up of very small tiny particles. Particles of matter have space between them they attract each other.
This chapter is for class 9 based on CBSE curriculum in which physical nature of matter, its characteristics are discussed along with states of matter, their inconversion, scales of temperature and difference between boiling and evaporation and factors affecting evaporation with inforgraphics and key points.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
6. Learning Objectives
• give an account of boiling and
condensation as processes of thermal
energy transfer without a change in
temperature
Boiling and Condensation
7. Boiling is the process in which the thermal energy
absorbed by a substance changes it from liquid state to
gaseous state without a change in temperature.
Boiling
During boiling, thermal
energy is absorbed to
break the bonds between
the liquid particles
8. Energy Transfer during Boiling
• From X to Y, the temperature of water
rises from 0°C to 100°C. The average
kinetic energy of the molecules
increases.
• From Y to Z, the temperature of water
remains steady at 100°C as it boils and
turns into steam.
• From Y to Z, the thermal energy is
used to break the bonds in between
the molecules and provide energy for
the molecules to escape into the
surroundings
9. Condensation is the process in which the thermal
energy taken away from a substance changes it
from gaseous state to liquid state without a
change in temperature. At condensation point,
the substance releases thermal energy as bonds
between the particles are being formed.
Condensation
10. Melting & Solidification
Learning Outcomes
• give an account of melting and solidification as
processes of thermal energy transfer without a
change in temperature
• draw and explain a cooling curve;
11. From P to Q, the
temperature of solid ice
rises from −15°C to 0°C.
From Q to R, the
temperature remains
steady at 0°C, even though
heat is being absorbed as
ice melts.
From R to S, the
temperature of melted ice
rises from 0°C to 10°C.
Determining the Melting Point of Ice
1
2
3
12. Energy Transfer During Melting
Between Q and R, thermal energy is
absorbed to break the strong bonds
between the particles of the solid ice.
Only the total internal potential
energy of the particles is increased.
Since total internal kinetic energy does
not increase, the temperature remains
constant during melting.
13. Determining the Freezing Point of Naphthalene
From A to B, the temperature
of naphthalene falls from 90°C
to 79°C.
From B to C, the temperature
remains steady at 79°C, even
though heat is being released
as solidification occurs.
From C to D, the
temperature of solid
naphthalene falls from 79°C
to 60°C.
1
2
3
14. Energy Transfer During Solidification
Between B and C, strong bonds are
formed when particles move close
together during freezing.
The total internal potential energy of
the particles decreases as thermal
energy is released and lost to the
surroundings.
Since total internal kinetic energy
does not decrease, the temperature
remains constant during
solidification.s
16. • Evaporation requires thermal energy from the
surroundings.
• In other words, it absorbs heat from the
surroundings to change the state of the
substance from liquid to gas.
• If you step out of a swimming pool on a dry and
sunny day, your body feels cold. Why?
Evaporation
17. Molecules in a
liquid are in
constant, random
motion.
The more energetic
molecules have sufficient
energy to overcome
attractive forces due to
other molecules to escape
from the surface into the
atmosphere.
Less energetic
molecules are left
behind. The average
kinetic energy of the
molecules
decreases and the
temperature
decreases.
Evaporation results in cooling.
1
2
3
How does Evaporation Occur?
18. Evaporation vs Boiling
Boiling Evaporation
Occurs at a particular
temperature
Occurs at any temperature
Relatively fast Relatively slow
Take place throughout the
liquid
Take place only at the surface
Bubbles are formed in the
liquid
No bubbles are formed in the
liquid
Temperature remains
constant
Temperature may change
External thermal energy
source required
External thermal energy
source not required
19. Rate of evaporation is
affectedby
Temperature
Pressure
Humidity
Movement of
air
Surface area
Boiling point of
liquid
The more humid the air is, the
lower the rate of evaporation.
The larger the surface
area, the higher the
rate of evaporation.
The lower the boiling
point, the higher the
rate of evaporation.The rate of evaporation
increases if the surrounding
air is moving.
Reducing atmospheric
pressure increases the rate
of evaporation.
The higher the
temperature, the greater
the rate of evaporation.
Factors Affecting Rate of Evaporation
20. • When perspiration evaporates from your
skin, you feel cooler.
• Using water to sponge a person having
fever will reduce his or her temperature
when the water evaporates.
• A refrigerator uses a coolant with a low
boiling point to remove heat via
evaporation and condensation.
Effects of Evaporation
21. Explain why putting a layer of perfume on the skin produces a
cooling effect.
Solution
• Perfume usually contains alcohol (which has a low specific
heat capacity) and evaporates easily.
• As evaporation removes heat from the skin, the skin feels
cool.
Evaporation
22. Learning Points
• Internal Energy is made up of kinetic and
potential energy
• Thermal Energy is absorbed during boiling
and melting; without a change in
temperature
• Thermal Energy is released during
condensation and solidification, without a
change in temperature
• Evaporation takes place at any temperature
and reduces thermal energy as a result
Editor's Notes
Click on the URL button to play a time lapse video that shows condensation taking place. Students may have the misconception that the liquid that forms on the outer surface of the glass is from the liquid in the glass. It is actually formed when water vapour from the surroundings condenses and form a layer of moisture on the glass.
Ask students if condensation has to take place at a fixed temperature (like boiling).
Recall from the kinetic model of matter (Chapter 9) what happens during a change of state in terms of the motion and forces between particles.
Recall from the kinetic model of matter (Chapter 9) what happens during a change of state in terms of the motion and forces between particles.
Tell students to take note that they need to follow the sequence above when describing the process of evaporation.
There are many other applications of evaporation. Give students key terms such as coal-fired power plants, instant coffee and orange juice in crystal form. Students are encouraged to read up and find out on their own how evaporation is applied.