Temperature Physics
Temperature
Physics
What is temperature?
• It is a variable to measure “hot” and “cold”. (We will see that it is a measure of an internal kinetic energy)
Conversion from °C to °F
Use this formula:
[°F] = [°C] × 9⁄5 + 32
Conversion from °F to °C
• Use this formula in order to convert °F to °C
• [°C] = ([°F] − 32) × 5⁄9
Gabriel Farenheit
Thermal Energy
• The total of all the kinetic and potential energy of all the particles in a substance.
As temperature increases, so does thermal energy (because the kinetic energy of the particles increased). Even if the temperature doesn’t change, the thermal energy in a more massive substance is higher (because it is a total measure of energy).
•
What is heat?
• The flow of thermal energy from one object to another.
• Heat always flows from warmer to cooler objects:
• Ice gets warmer while hand gets cooler Cup gets cooler while hand gets warmer
•
Heat transfer: conduction
Heat flows directly through a material• Heat flow fast= good thermal conductor• Heat flow very slow= thermal insulator
Convection
Heat transfer by movement of matter in a fluid.
• Forced convection (Fan, Pump)• Natural convection: (Heater, circulation -
warm air raises up, cold air sink down).
Radiation-Every object is emitting electromagnetic waves regardless of temperature .
Things we can see from their own radiation are very hot to have energy emitted in the visible region of the spectrum.
-Things also absorb radiation: If they didn’t, they would run out of energy to emit .