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The application of the principle of expansion and contraction of matter in dailylife.

Mercury in glass thermometer1. A mercury in glass thermometer works on the expansion and contraction of mercury

in the bulb of the thermometer.

2. When the thermometer is used to measure the temperature of a hot object, themercury in the bulb expands and forces the mercury in the glass tube to go up.3. When the thermometer is used to measure the temperature of a cold object, the

mercury in the bulb contracts and the mercury in the glass tube goes down.

Bimetallic Strip in Fire Alarm1. A bimetallic strip is made of two dierent metal strip, such us copper and iron.2. opper expands faster than iron when heated and cause the bimetallic

strip to bend.3. !imetallic strips are used as automatic switches in "re alarms and as thermostats in

electrical appliances such as iron, air#conditioners, rice cookers and refrigerators tokeep thetemperature in these appliances constant.

$igure %.2& 'g. 122

Gaps n !ailway Trac"s1. (aps are left in between sections of rails to allow for the expansion of the rails during

)ery hot weather.2. oncrete roads are built with expansion gaps to allow for the expansion of the

concrete during hot weather.

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!ollers in concrete and steel #ridgesoncrete bridges and steel bridges ha)e rollers on one end to allow for expansion on hotdays and cold days.

$lectricty ca#les and telephone wires1. *he wires expand and sag during hot days.2. +uring cold nights, the wires contract and become shorter.3. lectric cables and telephone wires are "xed loosely to allow for expansion and

contraction.

The use of the principle of expansion and contraction of matter in sol%ing simplepro#lems

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