Physics- P1 ~ Matter
OCR Gateway Physics P1 Matter: Topic Summary
- Created by: Caitlin1602
- Created on: 11-02-18 13:38
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- Physics- P1 ~ Matter
- Density
- Density = Mass (kg) / Volume (m^3)
- Different densities have different states; solids, liquid & gas
- Different densities also have different masses of atoms
- Different densities all have a different arrangement
- Air & Water
- There is less air pressure up a mountain, it increases as you go down
- Difference in liquid pressure between A and B (Pa) = height of column (m) x density of liquid (kg/m^3) x g (N/kg)
- Water pressure is less at the surface, increases as you go down
- Pressure depends on depth and density of liquid
- Changes of State
- Mass is conserved when substances change state
- Heating increases energy stored which changes state (physical change, not chemical reaction, can be reversed
- Thermal energy for a change in state (J) = mass (kg) x specific latent heat (J/kg)
- Change in thermal energy (J) = mass (kg) x specific heat capacity (J/kg celsius) x change in temperature (celsius)
- Atoms
- Everything is made up of atoms. Atoms are about 10^-10 in diameter
- Pressure
- Gas pressure is from molecules colliding so temperature & pressure goes up
- Pressure & volume, changing volume changes pressure, or vice versa
- Pressure (Pa) x Volume (m^3) = constant
- Pa = pascals = 1 N / m^2
- Pressure (Pa) x Volume (m^3) = constant
- Atmospheric Pressure- If we assume our atmosphere has uniform density : Pressure is bigger near surface of Earth due to weight of air above
- Atmospheric pressure = 100 kPa
- Density
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