1. Why Do We Sweat?
Temperature (C)
Symptoms 37
normal 44
death*

2. Water Makes the Perfect Sweat
High Heat of Vaporization (evaporation)
High Specific Heat

3. Heat of Vaporization Heat of Vaporization kJ/kg Substance
Ethyl Alcohol
855
Ammonia
1369
Helium 21
Lead
871
Nitrogen
200
Oxygen
213
Turpentine
293
Water
2260 (about 540 calories per gram)

4. Which can hold more heat?
1 pound of solid iron at 50 degrees C
1 pound of water at 50 degrees C or

5. Specific Heats of Various Materials
Substance
J/gm K
Aluminum
0.9
Iron
0.46
Copper
0.386
Zinc
0.387
Mercury
0.14
Alcohol(ethyl)
2.4
Water
4.186
Ice (-10 C)
2.05
Granite
0.79
Glass
0.84

6. Water has a very high specific heat
This means that water can absorb a lot of heat before it begins to get hot
This is why water is in your car's radiator as a coolant
helps explain the moderate temperatures on the coast.