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O

 

H

C == OH

C — C — C

C == OH

H

O

['si: 'θr 'eitʃ 'tu:]

['si: 'tu: 'əυ 'tu: 'əυ 'eitʃ tu:]

Appendix 15

Thermal Expansion, Temperature

temperature (n) A property of an object that indicates in which direction heat energy will flow if the object is placed in thermal contact with another object. Heat energy flows from places of higher temperature to places of lower temperature.

Zeroth law of If two bodies X and Y are each separately in thermal thermodynamics equilibrium with another body Z, then they are in thermal equilibrium with one another. In the most

common case the body Z is a thermometer.

temperature scale A sequence of values which represent temperature. Such a sequence is usually obtained by choosing two fixed points (identified by specified properties of stated substances) between which there are subdivisions made on a chosen basis. The Celsius scale has 99 divisions between the melting point of pure water and the boiling point of pure water.

Celsius scale A temperature scale for which the ice point is at 0° and the steam point is at 100°. One Celsius degree is defined as 1/100 of the temperature interval between the ice point and the steam point.

96