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Energy Units and Prefixes

Units of Measurement

A unit of measurement or unit is an aid needed in measuring. With the help of units things can be compared with each other. Specific units have been decided on for measuring different things. For example, solid, loose and stacked cubic metres are used when wood material is measured.  

Solid cubic metre (m³)

  • One solid cubic metre equals approximately 2,5 loose cubic metres (range 2,2–2,6).

Loose cubic metre (m³ᶩ ͮ )

  • One loose cubic metre equals approximately 0,40 solid cubic metres and thus equals 400 litres (range 0,38–0,46).

Stacked cubic metre (m³ˢᵗ)

  • One stacked cubic metre is a cubic metre of tightly stacked, usually chopped firewood.
  • One stacked cubic metre equals approximately 0,67 solid cubic metre, and 670 litres.

You can do volume and cubic metre calculations at http://www.muunnin.com/tilavuus/ (in Finnish).

Basic Units

Basic unit is a unit of measurement, of which other units of measurements are derived from. The following units are used to describe energy:

  • toe = The tonne of oil equivalent. The amount of energy which equals      one tonne of oil.
  • Wh = watt-hour
  • J = joule
  • cal = calorie

Prefixes

Numerical prefixes state the multiple of the unit following the numerical prefix. For example, kWh means Kilowatt-hour.

  • K = kilo = 103 = 1 000
  • M = mega = 106 = 1 000 000
  • G = giga = 109 = 1 000 000 000
  • T = tera = 1012 = 1 000 000      000 000
  • P = peta = 1015 = 1 000 000      000 000 000

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