1. Thermal Equilibrium Temperature Scale Practical Thermometers

2. Temperature

3. Thermal Equilibrium
Zeroth Law of Thermodynamics

4. Heat Energy transferred due to temperature difference
Energy on the move
From high to low temperature
Heat vs. Temperature

5. Making a thermometer Thermometric Properties Length Resistance
Pressure
Voltage

6. Temperature Scales Celsius Scale Fahrenheit Scale Ice point, 0
Steam point, 100
100 divisions in between , hence a.k.a. centigrade scale
Unit: degree Celsius, C
Fahrenheit Scale
Ice point, 32
Steam point, 212 
180 divisions in between ice point and steam point
Unit: F

7. Thermodynamic Scale Absolute zero, 0 Triple point of water, 273.15
100 divisions in between ice point and steam point
This scale does not depend on the property of any particular substance
a.k.a absolute scale
Conversion: K = C

8. Types of Thermometer Liquid-in-glass Constant Volume Gas Thermometer
Length of liquid thread
Convenient, portable
Fragile, limited range
( K)(IPTS)
Constant Volume Gas Thermometer
Pressure of a fixed mass of gas
Wide range, accurate
Bulky, inconvenient, slow to respond
Below 90K

9. Types of Thermometer Resistance Thermocouple
Electrical resistance of platinum coil
Wide range, accurate
Best type for small temp differences
Slow to respond K
Thermocouple
emf across junctions of 2 dissimilar metals
Fast response, wide range
Can be stored
For accuracy, high resistance millivoltmeter must be used K

10. Types of Thermometer Pyrometer
Color of thermal radiation from hot object
No contact with hot object
Can be portable
Not highly accurate
Above 1336K

11. The End