11. Thermometers used at weather stations to
meaure air temperature are similar to
household thermometers. They contain
liquid which expands or contracts with
changes in temperatures.
Mercury is most often used because it is a
liquid metal which readily expands and
contracts with changes in temperature.
The temperature scale used on weather
thermometers may be either the
FAHRENHEIT (F) or CENTIGRADE (C)
scale.
12. To change and to change
Fahrenheit to Centigrade to
Centigrade: Fahrenheit:
• C = 5/9 (F – 32) • F = 9/5C + 32
13.
14. The properties of all materials are
also markedly affected by temperature
changes. At arctic temperatures, for
example, steel becomes very brittle and
breaks easily, and liquids either solidify
or become very viscous, offering high
frictional resistance to flow. At
temperatures near absolute zero, many
materials exhibit strikingly different
characteristics. At high temperatures,
solid materials liquefy or become
gaseous; chemical compounds may break
