Synthetic fibres are man-made fibres created through chemical processes rather than obtained from natural sources. Common synthetic fibres include nylon, polyester, acrylic, and rayon. Nylon is strong and elastic while polyester is resistant to chemicals and dries quickly. Acrylic is often used as a wool substitute as it is durable and washable. Rayon is made from cellulose but requires extensive chemical treatment. Synthetic fibres have advantages like strength, shape retention, and lower cost compared to natural fibres, but can be rough, flammable, and poor moisture absorbers. Plastics can be thermosetting or thermoplastic, with thermosetting plastics rigid and therm
Chapter - 3, Synthetic Fibres and Plastics, Science, Class 8Shivam Parmar
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Chapter - 3, Synthetic Fibres and Plastics, Science, Class 8
FIBRES AND FABRICS
TYPES OF FIBRES
NATURAL FIBRES
SYNTHETIC FIBRES
RAYON
NYLON
POLYESTER
ACRYLIC
CHARACTERISTICS OF SYNTHETIC FIBRES
PLASTICS
TYPES OF PLASTICS
THERMOPLASTICS
THERMOSETTING PLASTICS
PROPERTIES OF PLASTICS
SOME USES OF PLASTICS
BIODEGRADABLE SUBSTANCES
NON - BIODEGRADABLE SUBSTANCES
PLASTICS AND THE ENVIRONMENT
PREVENTION OF PLASTICS
3 R PRINCIPLE
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)
Class 8 NCERT Science Chapter-3 Synthetic Fibers PPTPragyaC1
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CBSE Class 8 / VIII General Ccience Power Point Presentation
Prepared By
Praveen M Jigajinni
DCSc & Engg,PGDCA,ADCA,MCA,MSc(IT),MTech(IT), M.Phil (Comp Sci)
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Cell No: 9431453730
FIBRE TO FARIC
A Material which is available in the form of thin and continuous stand is called Fibre.
The thin strands of thread that we see are made up of still thinner strands called Fibres.
The cloth produced by weaving or knitting textile fibre is called Fabric.
There are two types of fibres, vi
1. Natural Fibre
2. Man – Made fibre or Synthetic Fibre
Chapter - 3, Synthetic Fibres and Plastics, Science, Class 8Shivam Parmar
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Chapter - 3, Synthetic Fibres and Plastics, Science, Class 8
FIBRES AND FABRICS
TYPES OF FIBRES
NATURAL FIBRES
SYNTHETIC FIBRES
RAYON
NYLON
POLYESTER
ACRYLIC
CHARACTERISTICS OF SYNTHETIC FIBRES
PLASTICS
TYPES OF PLASTICS
THERMOPLASTICS
THERMOSETTING PLASTICS
PROPERTIES OF PLASTICS
SOME USES OF PLASTICS
BIODEGRADABLE SUBSTANCES
NON - BIODEGRADABLE SUBSTANCES
PLASTICS AND THE ENVIRONMENT
PREVENTION OF PLASTICS
3 R PRINCIPLE
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)
Class 8 NCERT Science Chapter-3 Synthetic Fibers PPTPragyaC1
Hi everyone,
This is my presentation for Chapter 3 of Science Class 8. This presentation is well made and has all the important topics required by a 8th grader. There's also additional information for proper foundation in the given topics. If you are satisfied by the presentation, then please comment and like!!! It will help me to provide more content in various subjects
Thank you :0
CBSE Class 8 / VIII General Ccience Power Point Presentation
Prepared By
Praveen M Jigajinni
DCSc & Engg,PGDCA,ADCA,MCA,MSc(IT),MTech(IT), M.Phil (Comp Sci)
For Any Queries Please feel free to contact:
Email Id : praveenkumarjigajinni@gmail.com
Cell No: 9431453730
FIBRE TO FARIC
A Material which is available in the form of thin and continuous stand is called Fibre.
The thin strands of thread that we see are made up of still thinner strands called Fibres.
The cloth produced by weaving or knitting textile fibre is called Fabric.
There are two types of fibres, vi
1. Natural Fibre
2. Man – Made fibre or Synthetic Fibre
IMPORTANCE OF CLOTHES,
FIBRE, fiber
TYPES OF FIBRE,
PLANT FIBRE,
ANIMAL FIBRE,
PROCESSING OF WOOL,
WOOL,
ANIMAL WOOL,
Shearing,
Scouring,
Sorting,
Burrs separation,
Dyeing,
Spinning,
YARN TYPES & ITS USES,
SILK,
SERICULTURE,
LIFE CYCLE OF SILKWORM,
PROCESSING OF SILK,
REARING OF SILKWORMS,
REELING OF SILK,
DYEING, SPINNING AND WEAVING ,
USES OF SILK,
Cotton,
Jute,
Chapter - 6, Combustion and Flame, Science, Class 8Shivam Parmar
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Chapter - 6, Combustion and Flame, Science, Class 8
INTRODUCTION
COMBUSTION AND TYPES
IGNITION TEMPERATURE
INFLAMMABLE SUBSTANCE
SOURCES OF SOLAR ENERGY
TYPES OF COMBUSTION
FIRE EXTINGUISHER
FLAME
FUEL AND ITS TYPES
FUEL EFFICIENCY
GLOBAL WARMING
ACID RAIN
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)
CBSE Class 8 / VIII General Ccience Power Point Presentation
Prepared By
Praveen M Jigajinni
DCSc & Engg,PGDCA,ADCA,MCA,MSc(IT),MTech(IT), M.Phil (Comp Sci)
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Email Id : praveenkumarjigajinni@gmail.com
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CBSE Class 8 / VIII General Ccience Power Point Presentation
Prepared By
Praveen M Jigajinni
DCSc & Engg,PGDCA,ADCA,MCA,MSc(IT),MTech(IT), M.Phil (Comp Sci)
For Any Queries Please feel free to contact:
Email Id : praveenkumarjigajinni@gmail.com
Cell No: 9431453730
SOUND
MUSICAL INSTRUMENT
PROPAGATION OF SOUND
PRODUCTION OF SOUND MUSICAL INSTRUMENTS
SPEED OF A SOUND
WOODWINDS INSTRUMENTS
String INSTRUMENTS
Percussion INSTRUMENTS
Brass INSTRUMENTS
SOUND PRODUCED BY HUMANS
SPEED OF LIGHT V/S SOUND
SOUND PRODUCED BY ANIMAL
VIBRATION & OSCILLATION
LOUDNESS AND PITCH OF SOUND
HUMAN EARS
PERSISTENCE OF HEARING
Echo & REVERBERATION
AUDIBLE AND INAUDIBLE SOUND
NOISE AND MUSICAL SOUND
Noise pollution
HEARING IMPAIRMENT
SIGN LANGUAGE
Reflection of sound
Uses of multiple reflection of sound
SONAR
this presentation is on the chapter reproduction in animals for class 8 . it includes all the topics in detail mentioned in the chapter . i have made it with a lot of hard work . hope u like it !
IMPORTANCE OF CLOTHES,
FIBRE, fiber
TYPES OF FIBRE,
PLANT FIBRE,
ANIMAL FIBRE,
PROCESSING OF WOOL,
WOOL,
ANIMAL WOOL,
Shearing,
Scouring,
Sorting,
Burrs separation,
Dyeing,
Spinning,
YARN TYPES & ITS USES,
SILK,
SERICULTURE,
LIFE CYCLE OF SILKWORM,
PROCESSING OF SILK,
REARING OF SILKWORMS,
REELING OF SILK,
DYEING, SPINNING AND WEAVING ,
USES OF SILK,
Cotton,
Jute,
Chapter - 6, Combustion and Flame, Science, Class 8Shivam Parmar
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 - 6, Combustion and Flame, Science, Class 8
INTRODUCTION
COMBUSTION AND TYPES
IGNITION TEMPERATURE
INFLAMMABLE SUBSTANCE
SOURCES OF SOLAR ENERGY
TYPES OF COMBUSTION
FIRE EXTINGUISHER
FLAME
FUEL AND ITS TYPES
FUEL EFFICIENCY
GLOBAL WARMING
ACID RAIN
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)
CBSE Class 8 / VIII General Ccience Power Point Presentation
Prepared By
Praveen M Jigajinni
DCSc & Engg,PGDCA,ADCA,MCA,MSc(IT),MTech(IT), M.Phil (Comp Sci)
For Any Queries Please feel free to contact:
Email Id : praveenkumarjigajinni@gmail.com
Cell No: 9431453730
CBSE Class 8 / VIII General Ccience Power Point Presentation
Prepared By
Praveen M Jigajinni
DCSc & Engg,PGDCA,ADCA,MCA,MSc(IT),MTech(IT), M.Phil (Comp Sci)
For Any Queries Please feel free to contact:
Email Id : praveenkumarjigajinni@gmail.com
Cell No: 9431453730
SOUND
MUSICAL INSTRUMENT
PROPAGATION OF SOUND
PRODUCTION OF SOUND MUSICAL INSTRUMENTS
SPEED OF A SOUND
WOODWINDS INSTRUMENTS
String INSTRUMENTS
Percussion INSTRUMENTS
Brass INSTRUMENTS
SOUND PRODUCED BY HUMANS
SPEED OF LIGHT V/S SOUND
SOUND PRODUCED BY ANIMAL
VIBRATION & OSCILLATION
LOUDNESS AND PITCH OF SOUND
HUMAN EARS
PERSISTENCE OF HEARING
Echo & REVERBERATION
AUDIBLE AND INAUDIBLE SOUND
NOISE AND MUSICAL SOUND
Noise pollution
HEARING IMPAIRMENT
SIGN LANGUAGE
Reflection of sound
Uses of multiple reflection of sound
SONAR
this presentation is on the chapter reproduction in animals for class 8 . it includes all the topics in detail mentioned in the chapter . i have made it with a lot of hard work . hope u like it !
All basics about synthetic fibers and different types of synthetic fibers & characteristics of each synthetic fibers we are using in our day today life .
Acetabularia Information For Class 9 .docxvaibhavrinwa19
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June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
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.
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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.
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2. Natural Fibres
A fibre is a thin thread of a natural
or artificial substance, especially one that is used to make
cloth or rope.
Fibres can be classified into 2 main categories: natural
and synthetic.
Natural fibres are obtained from natural sources such as
animals and plants
3.
4. Plant Fibres
Cotton: Cotton fibre is obtained from the cotton plant. It is
one of the traditional fibres used in the textile industry
Linen: Linen fabric is obtained from the flax plant. The
properties of linen fabric are very much similar to cotton
fabric.
Jute: It is obtained from the jute plant. On account of its
high strength, it is perfect for use in packaging material.
5. Animal Fibres
Silk: Silk is obtained from silk worms. The most popular kind of silk is
obtained from the mulberry silk worm.
Wool: Wool is commonly obtained from sheep. Wool fabric is soft to
the touch and provides warmth to the weather, due to which it is the
preferred choice for winter apparel.
6. Yak fibre: The yak is an animal that is largely found in the
Himalayas in India and Tibet. The hair of the yak is very useful in the
production of warm clothes, mats and sacks.
7. Synthetic Fibres
Synthetic fibres are man-made fibres.
Synthetic fibres are made from different chemicals, hence
each kind of synthetic fibres have their own properties.
Synthetic fibres are more in length and are long lasting.
The only limitation in synthetic fibres is that they are poor
absorbents of moisture and they catch fire easily
8. Synthetic Fibres
• Many items of clothing contain materials such as polyester,
polyamide, terylene, rayon etc.
• The items previously mentioned are all man-made fibres, and
are called synthetic fibres.
9. Synthetic Fibres
A synthetic fibre is a chain of small chemical units joined
together.
Each small unit is called a monomer.
Large chain formed by many monomers is called a Polymer.
The process of combining small monomers to form a large
polymer is called Polymerisation.
10. Rayon
Rayon is prepared from cellulose.
Though cellulose is a natural polymer it needs extensive
chemical treatment to form rayon.
It is also called artificial silk.
It absorbs moisture and is comfortable to wear.
It can be easily dyed in vivid colors.
11. Properties of rayon
Properties
of rayon
easily dyed
and
wooven
into cloth
drapes well
lustrous in
appearance
good
absorbent
of sweat
12. Uses of
rayon
Mixed with
fibre glass for
making
helmets
Used to make
Jackets and
tracksuits.
Surgical
Dressings.
Reinforcing
nylon tyres
Upholstery for
luxury cars
and officeand
home
furnishings
Curtains
because it
drapes well
Dress material
because it is
soft, silky and
moisture
absorbent
13. Nylon
Chemically it is a ‘polyamide’, a polymer. It is the strongest
synthetic plastic material which can be moulded to any shape.
It is strong and easy to dye.
Nylon fibres do not absorb water easily.
It is elastic in nature and hence, highly durable.
14. Properties
of nylon
toughest elastic
material
high tensile
strength
slightly water
absorbent, dries
quickly
It can be
moulded into
fibres, bristles,
sheets, rods,
tubes and
coatings
resists oil,
grease, moths,
fungus and
other pests
can be made
into palates or
powdered
is lustrous and
easy to wash
16. Polyester
Alcohol and organic acid react together to make
compounds called esters which are polymers
Polyesters come under the brand names of ‘Terylene’,
‘Dacron’, ‘Terene’ and ‘Polyester’.
18. Uses of
polyester
making magnetic
audio and video
cassettes and floppy
disks.
highly suitable for
shirting, suiting,
sarees and
draperies
mixed with fibre
glass for moulding
it into helmets,
protective sheets
and hulls in boats
19. Acrylic
Acrylic is often used as a substitute for wool.
Acrylic fibres are strong and wrinkle-resistant.
It is easy to wash and dries quickly.
It is resistant to moths, oils, chemicals and deterioration
on exposure to sunlight.
20. Properties
of acrylic
Resistant to
moths
Soft with
crimps
resembling
wool
Is durable light
and washable
Strong and
stain resistant
Also available
in sheets
Can be dyed in
different colors
21. Uses of
acrylic
Acrylic knitting wool
is good for baby
wears because they
are soft, warm and
washable.
Used for making
artificial fur,
blankets, carpets
etc.
A transparent type
of acrylic is used to
cover automobile
lights, lenses
surgical tools etc
22. Blending Fibres
Terylene and cotton blend, known as terrycot is used for
making dress materials.
Terylene and wool blend is known as terrywool is used as a
substitute for costly woollen clothes.
Polyester and cotton blend is more crease-resistant.
Acrylic and wool blend trousers are less expensive.
23. Advantages of Synthetic fibres
Strong
Synthetic fibres are strong so they can take up heavy things easily.
Retain their original shape
Synthetic fibres retain their original shape so it's easy to wash and wear.
Elastic
Can easily be stretched out.
Soft
Synthetic fibres are generally soft so they are used in clothing materials.
Colour
Varieties of colours are available as they are manufactured.
Cost
Clothes made by synthetic fibres are generally cheaper than those made by
natural fibres.
24. Disadvantages of Synthetic Fibres
Does not absorb moistures
Synthetic fibres do not absorb sweat, trapping heat in our
body.
Rough feel
Synthetic fibres may give rough feel, making it unsuitable
for pyjamas, underwear, etc.
It is dangerous to wear near fire, as they catch fire easily.
They cannot be easily ironed as they melt very easily.
27. Thermosetting plastics
Thermoset plastics are hard and rigid. Example is Bakelite
and melamine.
Thermoset can be moulded to set it in any shape but it cannot
be remoulded.
It is dark in color, hard and resistant to heat and electricity.
It is being widely used for the handle of kettles and pans.
Earlier black telephone sets, electric switches, electric lamp
holders, pins and plugs were made from thermoset plastic.
28. Examples of theroset plastics
Thermoset handles
A firemans uniform is coated with thermoset plastic to
made it fire resistant
Melamine wares
An electric pin (black)
29. Thermoplastics
Thermoplastics are soft and flexible.
They are not elastic like rubber and steel springs.
They melt on warming and regain their shape on cooling.
Thermoplastics can be drawn into fine fibers, moulded to
any desired shape or stretched or spread as sheets.
Some of the better known thermoplastics are nylon
(polyamide), polyesters, polyethylene, polyvinyl chloride
(PVC), acrylic, polyurethane, polypropylene (PP), poly-
tetra-fluoro-ethylene (PTEE) etc
31. Properties of Plastics
Resist corrosion
Resist high temperatures
Insulate heat and electricity
Elastic
Thermoplastics can be recycled
Not reactive to Chemicals and water
Water resistant
soft when hot
32. Plastics and the environment
Recycling waste plastic is very important. It may kill
many animals as well as polluting Earth.
Plastics are not biodegradable.
Few years ago, scientists have discovered photodegradable
plastics that can be broken down by sunlight, but it takes
very long time to rot.
Recently, scientists developed biopolymers, biodegradable
polymers. They rot very easily, for example plastics made
from corn starch, dissolves rapidly in water.