PPT - Heat

# PPT - Heat - Science Class 7

``` Page 1

CHAPTER - 4

HEAT
Page 2

CHAPTER - 4

HEAT
1) Hot and cold :-
In our daily life we come across a number of objects.
Some of them are hot and some of them are cold.
Eg :- Tea is  hot and ice is cold.
Some objects are hotter than others and some are colder
than others.
We often decide which object is hotter than the other by
touching the objects.
We cannot always rely on our sense of touch to decide
how hot or how cold an object is.
The hotness of an object is measured by its temperature.
Temperature :- is a measure of the degree of hotness of an
object.
Temperature is measured by a device called thermometer.

Page 3

CHAPTER - 4

HEAT
1) Hot and cold :-
In our daily life we come across a number of objects.
Some of them are hot and some of them are cold.
Eg :- Tea is  hot and ice is cold.
Some objects are hotter than others and some are colder
than others.
We often decide which object is hotter than the other by
touching the objects.
We cannot always rely on our sense of touch to decide
how hot or how cold an object is.
The hotness of an object is measured by its temperature.
Temperature :- is a measure of the degree of hotness of an
object.
Temperature is measured by a device called thermometer.

Clinical thermometers
Page 4

CHAPTER - 4

HEAT
1) Hot and cold :-
In our daily life we come across a number of objects.
Some of them are hot and some of them are cold.
Eg :- Tea is  hot and ice is cold.
Some objects are hotter than others and some are colder
than others.
We often decide which object is hotter than the other by
touching the objects.
We cannot always rely on our sense of touch to decide
how hot or how cold an object is.
The hotness of an object is measured by its temperature.
Temperature :- is a measure of the degree of hotness of an
object.
Temperature is measured by a device called thermometer.

Clinical thermometers Digital thermometers
Page 5

CHAPTER - 4

HEAT
1) Hot and cold :-
In our daily life we come across a number of objects.
Some of them are hot and some of them are cold.
Eg :- Tea is  hot and ice is cold.
Some objects are hotter than others and some are colder
than others.
We often decide which object is hotter than the other by
touching the objects.
We cannot always rely on our sense of touch to decide
how hot or how cold an object is.
The hotness of an object is measured by its temperature.
Temperature :- is a measure of the degree of hotness of an
object.
Temperature is measured by a device called thermometer.

Clinical thermometers Digital thermometers 2) Measuring temperature :-
The thermometer that measures the temperature of our
body is called clinical thermometer.
A clinical thermometer has a long narrow glass tube. It has
a bulb at one end containing mercury. It has a scale called
celsius scale marked in
0
C (degree celsius). A clinical
0
C to 42
0
C.The
clinical thermometer has a small kink near the bulb to
prevent the mercury level from falling down.
The normal temperature of the human body is 37
0
C.

mercury
Clinical thermometer
kink
kink
```

## Science Class 7

142 videos|317 docs|54 tests

## FAQs on PPT - Heat - Science Class 7

 1. What is heat?
Ans. Heat is a form of energy that is transferred from one object to another due to a difference in temperature. It flows from hotter objects to colder objects until they reach thermal equilibrium.
 2. What are the three methods of heat transfer?
Ans. The three methods of heat transfer are conduction, convection, and radiation. Conduction is the transfer of heat through a material, convection is the transfer of heat by the movement of fluids, and radiation is the transfer of heat through electromagnetic waves.
 3. How is heat measured?
Ans. Heat is measured in units of energy, such as joules or calories. The most common unit of heat measurement is the calorie, which is the amount of energy needed to raise the temperature of one gram of water by one degree Celsius.
 4. What are some examples of good conductors and insulators of heat?
Ans. Good conductors of heat include metals such as copper and aluminum, while good insulators of heat include materials such as wool, fiberglass, and air.
 5. How does heat affect matter?
Ans. Heat can cause matter to change its state, such as melting or boiling. It can also cause matter to expand or contract, and can affect the chemical reactions that occur in matter.

## Science Class 7

142 videos|317 docs|54 tests

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