Pysics

Heat

• Heat can be transferred from place to place by conduction, convection and radiation.
• dark matt sufaces are better at absorbing heat enegry than light shiny surfaces.
• energy can be lost from homes in many different ways but there are ways to solve this.

Heat transfer by conduction and convention

• Heat is a thermal energy.
• it can be transferred from one place to another by conduction, convention and radiation.
• conduation and convention involve particles, but radiation involves electromagnetic waves.

Conduction

• Heat energy can move through a substance by conduction.
• Metals are good conductors of heat, but non-metals and gases are poor conductors.
• Poor conductors of heat are called insulators.
• The electrons in a piece of metal can leave their atoms and move about in the metal as free electrons.

Convection

• Liquids and gases are fluids.
• convention accours when particles with alot of heat energy in a lquid or gas move and take the place of particles with less energy.
• Liquids and gases expand when they are heated.

Radiation

• All objects give out and take in thermal radiation, which is also called infrared radiation.
• the hotter the object is the more infrared radiation it emits.
• some surfaces are better than others at reflecting and absorbing…