Smug Life
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What does this mean in the OCR A Specification under "Temperature"? "Describe how there is an absolute scale of temperature that does not depend on the property of any particular substance (ie the thermodynamic scale and the concept of absolute zero)"

Could someone explain this? I understand what absolute zero is.
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MrMatheson
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Degrees centigrade was based on water freezing at 0 and boiling at 100, but this was hard to get right since the boiling point also depends on pressure (water can 'boil' at room temperature with low pressure)

The absolute scale is based on two fixed points. Absolute zero (where the particles have minimal internal energy) and the triple point of pure water. The triple point is where you can have ice, liquid water and water vapour but this only occurs at one temperature and one pressure. We then divide these two points into 273.16 small chunks, each of which is 1 Kelvin. We can also take 273.15 from each Kelvin to get out degree Celsius scale (which is based on the absolute Kelvin scale).

Does that help?

Lewis

www.alevelphysicsonline.com
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