The document explains the concept of heat as energy measured in joules, detailing its distinction from temperature. It discusses heat sources, their applications, and temperature measurement units, such as Celsius, Fahrenheit, and Kelvin. Additionally, it covers various types of thermometers and their properties.

2. Heat is a form of _______
Ans: energy

3. The S.I. unit of heat_______
Ans: joule

4. 1 joule = _______ cal
Ans: 0.24

5. Heat is a form of energy because ___________
Ans: It has the capacity to do work

6. Write True/ False
On touching a lump of ice, we feel cold because
some heat passes from our body to the ice
Ans: True

7. Write True/ False
Heat flows from a body at a lower temperature to a
body at a higher temperature when they are kept in
contact
Ans: False

8. List any two sources of heat
Ans: Sun, fire, electricity, human body, chemical reactions,
friction

9. List any two applications of heat
Ans: cooking, food preservation, power generation,
transportation

10. Temperature
•Temperature is the degree of hotness or
coldness of a body
•When a body is heated, its temperature
rises and when it is cooled, its temperature
falls

11. Units of Temperature
•Degree Celsius (C)
•Degree Fahrenheit (F)
•Kelvin (K) – S.I. unit

12. Difference between heat and
temperature
Heat Temperature
It is a form of energy It is the degree of hotness
or coldness of a body
Flows from a hot body to a
cold body
Rises when heated and
falls when cooled
It is a cause It is an effect
It is measured in joules It is measured in Kelvin

13. Thermometer

14. Why Mercury???
Liquid at room temperature
Good conductor of heat
High boiling point
Consistent expansion

15. Parallax error

16. Types of thermometer
•Clinical thermometer

17. •Laboratory thermometer

18. •Digital thermometer

19. Infrared thermometer Infrared Ear thermometer

20. Magic Mug