Physics | P1 | Energy transfer by heating | 1.1 In
Physics | P1 | Energy transfer by heating | 1.1 Infared radiation | 1.2 Surfaces and radiation
- Infared radiation is energy transfer by electromagnetic waves.
- Infared waves are part of the electromagnetic spectrum.
- We can detect infared radiation with our skin - it makes us feel warm.
- All objects emit (give off) infared radiation.
- The hotter the object, the more infared radiation it emits.
- Infared radiation can travel through a vacuum, for example space.
- Infared does NOT involve particles like the other forms of radiation.
- Matt surfaces emit and absorb more infared radiation than shiny surfaces.
- Darker objects emit and absorb more infared radiation than lighter objects.
Matt black Shiny black Matt white Shiny white
Physics | P1 | Energy transfer by heating | 1.3 St
Physics | P1 | Energy transfer by heating | 1.3 States of matter
- 3 states of matter: Solid, Liquid, Gas. We can make a substance change between these states by heating or cooling it.
- Solid - The particles vibrate about fixed positions. Fixed shape and volume. Particles arranged in ordered rows and columns. Very close together.
- Liquid - The particles are close together but can move around at random. Fixed volume. Takes the shape of its container.
- Gas - The particles are far apart and can move quickly at random. Fills avaliable space. Spreads out.
Solid Liquid Gas