Temperature and Thermometers

Temperature

Temperature

the measure of the hotness or coldness of a body

Heat

a form of energy

Thermometric Property

a property that measurably changes with temperature

Thermometer

an instrument used to measure temperature

Internal Energy

the energy possessed by a body due to the vibration of its molecules

SI Unit of Temperature

kelvin

Kelvin Symbol

K

Everyday Temperature Scale

celsius

Celsius Symbol

C

Kelvin Advantages

always positive as it begins where physics breaks down

Kelvin Formula

TK = TC + 273.15

Examples of Thermometric Properties

length of a column of liquid, resistance, electromotive force, colour, volume of a gas at a constant pressure, pressure of a gas at a constant volume

Length of a Column of Liquid

liquid in a thin capillary tube changes with temperature - mercury/alcohol thermometer

Resistance

electrical resistance of a conductor changes with temperature - resistance thermometer

Electromotive Force of a Thermocouple

emf changes when the temperature of two junctions does - thermocouple

Colour

certain crystals change colour with temperature- colour thermometer

Volume of a Gas at Constant Pressure

volume of gas changes with temperature - gas thermometer

Pressure of a Gas at a Constant Volume

pressure of a gas changes when temperature does - weighted gas thermometer