Temperature and its scale

3. ICE CREAM ICE CUBE

4. FIRE
TEA

5. We know that some
objects are hotter than
others, while some of
them are colder than
others.

6. We need a reliable
quantity to quantity to
decide the degree of
hotness or coldness of
an object.

7. What is temperature?
Temperature is a physical
quantity that expresses the
degree of hotness or coldness
of a substance

8. When heat is given to a substance,
temperature increases.
Examples:

9. When heat is removed from a substances,
temperature decreases.
Examples:

10. Temperature is the measure of the average
kinetic energy of the particles in a system.
Its SI unit is Kelvin.
How do you measure temperature?
Thermometer

11. Usually thermometres are calibrated with some standard scales.

12. Melting point of pure ice (0°C)
Boiling point of water (100°C)

13. Types of
scales
LFP UFP No. of
Divisions
Celsius (C) 0°C 100°C 100
Fahrenheit (F) 32°F 212°F 180
Kelvin (K) 273 K 373 K 100
Various scales to measure temperature

14. The general formula for conversion of scales of temperature:
C-0 F-32 K-273
100 180 100

15. Application of Various thermometric scales:
1.Physicians use ‘Clinical thermometres’. It is
graduated in ‘Fahrenheit scale’.
2.Scientists are using thermometer with ‘Kelvin scale’.
3.Common temperature measurements are made in
‘Celsius scale’.
Example: Weather reports are given in Celsius scale.
CELSIUS

16. ASSIGNMENT
1.Define temperature?
2.Which instrument is used to measure
temperature?
3.Write the upper fixed point and lower
fixed point in Celsius, Fahrenheit, and
Kelvin scale.