SpecificHeat Thermal Physics: Unit 04 IDS Physics: M. Blachly
The Blachly Scale • Mr. Blachly invents a new temperature scale: • 100 B is the temperature at which a Twix Bar starts to melt. (30C) • 40 B is the temperature at which a Twix Bar is perfect for eating. (5C) • What is room temperature, 22 C, in B
Heat Capacity • Demo: the candle and the balloon
Heat Capacity • All substances will change temperature as they gain thermal energy. • The magnitude of the chance depends on the substance and the mass.
Example • To take a bath, you need to warm up 300 kg. of water from 55 F to 105 F. How much energy will you need? • If energy costs $0.10 per 3.6 MJ, what will it cost?
Applications • Feel the leg of your chair and the leg of the table. Are they the same temperature? • Why is the hard floor cold and the carpet warm? • Why do some parts of the pizza burn your mouth and other parts do not? • Coke in bottles vs. coke in cans