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ADAS-Diver Physics - Coggle Diagram

- - - - 1 tonne = 1000 kilograms
      - 1 kilogram = 1000 grams
      - 1 gram = 1000 milligrams
      - 1 mg = 1000 micrograms
      - 1 litre of fresh water = 1 kilogram
      - 1 millilitre of fresh water = 1 gram
    - - When discussing fluids, the unit of volume is expressed in litres
      - When discussing objects, the unit of volume is discussed in cubic metres (m3). 1 cubic metre = 1000 litres
      - Very basically, the volume of a rectangular prism or square object (cube) is calculated using the following formula:
        Volume = Length x Breadth x Height
      - To calculate the volume of irregular shaped objects, you can use the formula:
        Volume = Mass / Density
    - - The basic metric unit for distance is the metre.
      - 1000 millimetres = 1 metre
      - 100 centimetres = 1 metre
      - 1000 metres = 1 kilometre
    - - Parts per million (ppm) is used for very small concentrations of gases. Just as ‘per cent’ means out of a hundred, so parts per million, or ppm, means out of a million. A chamber, for example, might contain 400 parts of carbon dioxide out of 1 million parts of gas. Calculations can be carried out directly in ppm, or by converting ppm to a percentage.
        To convert ppm to a decimal, move the decimal point back 6 places.
        To convert ppm to a percentage, move the decimal point back 4 spaces.
        EXAMPLE:
        400 ppm is 0.0004 of the sample volume.
        750 ppm is 0.075% of the sample volume.
    - - The unit for density is grams per cubic centimetre (g/cm3), sometimes expressed in kilograms per cubic metre or litre (kg/m3). The densities of fresh and sea water are usually expressed in grams per millilitre (g/mL) or kilograms per litre (kg/L).
      - Density can be calculated by dividing mass by volume:
      - Density = Mass / Volume
      - In general terms, the greater the density of a substance the heavier the substance will be per unit volume. Some common densities related to diving and underwater work are shown in the table below.