Heat and Temperature

By Tommy Heydinger

Overview by Mr. Edmonds

Difference between heat and temperature.

http://www.youtube.com/watch?v=_M7U7_N3wBc

Temperature

• Temperature: Quantity that can

be measured.• Celsius,

Fahrenheit, Kelvin• Absolute zero• 0°C = 273 K• 100°C = 373 K

Conversions

Fahrenheit Celsius TC= 5/9 (TF – 32.0)

Celsius Fahrenheit TF = (9/5 × TC) + 32.0

Kelvin Temperature Scale

Scientific significance.

Similarities of Kelvin and Celsius Scales

0°C = 273.15 K

Kelvin Temp.

T = TC + 273.15

Linear Thermal Expansion

Definition

Coefficient of expansion

Change in Length=(Original Length)(coefficient of expansion)(change in temperature)

SI unit for coefficient of expansion- °C-1

Bimetallic Strip

Two thin strips of metal.

Brass and Steel

Uses and reactions.

Area Expansion

Explanation

Change in Area= 2(original area)(coefficient of linear expansion)(Change in temperature)

Demonstration

Volume Expansion

Definition

Change in volume= (original volume)(coefficient of volume expansion) ✖ (change in temperature)

β=Coefficient of volume expansion

Specific Heat

Transfer of Energy

Specific Heat

Joule per kilogram degree Celsius (J/kg°C)

Change in Heat= (mass)(specific heat)(change in temperature)

Specific heat of water = 5187 J/kg°C

Heat of Fusion

Explanation

Change in heat=(mass)(heat of fusion)

SI unit= J/kg

Water heat of fusion=3.35 ✖ 105 J

Heat of Vaporization

Explanation

Change in heat = (mass)(heat of vaporization)

SI unit= J/kg

Water heat of vaporization = 2.26 ✖ 106 J/kg

Conduction

Transfer of heat

Direct Contact

Poor conductors Wood, paper, air

Strong conductors Copper, silver, iron

Convection

Up and down movement of gases and liquids.

Heat rises, cool air falls

Examples Hot air balloon Lower floors in a

building. Lakes/pools

Radiation

Electromagnetic Waves

Transfer of heat

Examples Microwave Lightbulb Fire

Bibliography

http://www.youtube.com/watch?v=_M7U7_N3wBc

Cutnell and Johnson, Physics Sixth Edition

Packet 11, Temperature and Heat.

http://www.wisc-online.com/Objects/ViewObject.aspx?ID=sce304