Physics- P1 ~ Matter

OCR Gateway Physics P1 Matter: Topic Summary

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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
      • 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

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