Expansion of Solid, Effect and Applications of Expansion

CONTENT

• Effect and Application of Thermal Expansion of Solid
• Advantages and Disadvantages of Thermal Expansion of Solid

Effect and Application of Thermal Expansion of Solid

1. When hot water is poured in a glass tumbler, it might crack due to the uneven expansion of the inner wall of the tumbler.
2. The cracking noise of zinc roof during the day and night.
3. Thermal expansion of solid is used in the construction of bridges in which one side is fixed and the other is placed on rollers to allow for expansion.
4. The stopper of a bottle can be removed due to the expansion of the glass.
5. In the construction of concrete pavement, little spaces are left within the concrete to allow for expansion.
6. Gaps are left in the construction of railway tracks to give room for expansion.
7. Bimetallic stripes are use in thermostat for controlling or regulating the flow of electric current.

Advantages and Disadvantages of Thermal Expansion of Solid

Advantages

1. Fire alarm e.g. electric bell
2. The fittings of wheels in rims
3. Bimetallic thermometer
4. Red hot rivet in ship building
5. Bimetallic stripes used in thermometer e.g. electric cooker etc

Disadvantages

1. Cracking of drinking glass when hot liquid poured inside
2. If the balance wheel of a watch expands the time will be fast and if the balance wheel of a watch contrasts the time will be slow
3. Expansion of metal of concrete bridges which can lead to eventual after a long period
4. Sagging of overhead wire due to contraction in winter season
5. Expansion of railway tracks thereby forming distant railway tracks.
6. Bursting of water metal pipes.

EVALUATION

1. Mention four effect of thermal expansion of solid.
2. Mention four the advantages and disadvantages of thermal expansion of solid.

Reading Assignment

www.google.com (click on google search, type “expansion of solid”, click on search) and New School Physics pg 37 – 42.

WEEKEND ASSIGNMENT

1. Gaps are left in the construction of railway tracks to give room for ………….

A. contraction B. evaporation C. expansion D. vaporization

• When hot water is poured in a glass tumbler, it might crack due to the …………  of the inner walls of the tumbler A. even expansion B. uneven expansion C. uneven contraction D. even contraction
• The stopper of a bottle can be removed due to the ………… of the glass

A. contraction B. expansion C. evaporation D. none of the above

• The following are advantages of thermal expansion of solids except A. bimetallic thermometer B. fire alarm C. sagging of overhead wire D. fitting of wheels in rims
• If heat is removed from solids they A. contract B. evaporate C. expand D. none of the above

THEORY

1. Mention four effects of thermal expansion of solid.

Mention four the advantages and disadvantages of thermal expansion of solid.