heat

• Temperature

  ● the hotness or coldness of things

  ● the average kinetic energy of the particles in a system
• Temperature

  ● can be measured in Celsius, Fahrenheit, Kelvin and Rankine.

  ● Kelvin is the SI unit of temperature.
• Heat

  ● also known as thermal energy

  ● defined as energy in transit

  ● a type of energy that transfers from one body to another whenever there is a difference in temperature

  ● symbol is Q, measured in Joules (J)
• Heat is the sum of all the kinetic energies of all the molecules of an object, while temperature is the average kinetic energy of the molecules of an object.
• When two objects of different temperatures come in

  contact, heat energy will always flow from the hotter object to the colder object.
• When the bodies have already achieved the same temperature, heat flow stops as thermal equilibrium is reached.
• Thermal Equilibrium

  • when two objects in thermal contact no longer affect each other's temperature.
• melting (solid to liquid) - heat absorbed

  freezing (liquid to solid) - heat released

  condensation (gas to liquid) - heat released

  evaporation (liquid to gas) - heat absorbed

  sublimation (solid to gas) - heat absorbed

  deposition (gas to solid) - heat released