Temperature, Heat, and Expansion

1. Temperature, Heat, and Expansion Chapter 21

2. Temperature • Quantity that tells • Matter ; • Related to of molecules in a • Proportional to • Temperature is kinetic energy • e.g. 2 liters v. 1 liter of boiling water

3. International scale • 0° = ; 100° = • US scale • = water freezing;= water boiling • SI scale • 0 = = lowest temperature =

4. Heat • from one object to another because of • transfer isfrom substance to a substance • Matter contains energy • Heat is • Once transferred,

5. Thermal contact • When from one object or substance to another , • heat flows from into • Heat flow is based on differences • Not kinetic energy • thumb tack v. pail of water • Water more molecular kinetic energy • BUT • Heat never flows

6. Thermal equilibrium • When objects in thermal contact with each • between them • i.e. a thermometer

7. Internal Energy • (KE from jostling molecules, rotational KE, KE due to internal movement, and PE) • A substance , it contains • When a substance , any of these energies

8. Measurement of Heat • Amount of heat transferred determined by of a known mass of water that • To quantify heat, we must specify the and of • cup of soup v. pot of soup

9. Unit for heat: • The amount of of 1 gram of by • Kilocalorie = 1000 calories = unit used in rating foods = Calorie • Calorie & calorie are units of energy • 1 calorie = • Energy value in food is determined by

10. Read p312 to review dimensional analysis