Heating houses Flashcards
How does energy flow?
Energy, in the form of heat, flows from a warmer to a colder body. When energy flows away from a warm object, the temperature of that object decreases.
How does a thermogram show colour?
A thermogram uses colour to show temperature; hottest areas are white/yellow, coldest are black/dark blue/purple.
What is temperature?
Temperature is a measurement of hotness on an arbitrary scale. You do not need to use a thermometer. It allows one object to be compared to another.
What happens when the temperature of a body increases?
When the temperature of a body increases, the average kinetic energy of the particles increases.
What is Heat?
Heat is a measurement of internal energy. It is measured on an absolute scale.
What is specific heat capacity?
- The energy needed to raise the temperature of 1 kg by 1 °C
- Measured in joule per kilogram degree Celsius (J/kg °C) and differs for different materials.
Energy is transferred
When an object is heated and its temperature rises.
What is the equation for energy transfer by specific heat capacity?
energy transferred =
mass × specific heat capacity × temperature change
What is specific latent heat?
- The energy needed to melt or boil 1 kg of the material.
- Measured in joule per kilogram (J/kg) and differs for different materials and each of the changes of state.
What happens when and object is heated and changes state?
When an object is heated and it changes state, energy is transferred but the temperature remains constant.
What is the equation for energy transfer by specific latent heat?
energy transferred =
mass × specific latent heat
Why is there no change in temperature when a substance is undergoing a change of state?
When a substance changes state, energy is needed to break the bonds that hold the molecules together. This explains why there is no change in temperature.
