86
Question
Identity the correct statements from the following :
Identity the correct statements from the following :
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Solution
The correct options are
A When hot water is poured into a thickly walled glass tumbler suddenly it develops cracks because of unequal expansions of the surfaces.
B For the use of hot liquids, thin-walled glass containers are preferred.
D Bimetallic strip works on the principle of unequal expansions.
OPTION A.Glass comes in the insulator class of material which means it is a poor conductor of heat. when you pour a very hot liquid into a thick tumbler what happens is, the surface of glass that comes in contact with the hot liquid heats up and expands as per its coefficient of thermal expansion, while the outer layer still remain cold and does not expands (because glass is a poor conductor and does not carry heat quickly). This leads to development of thermal stresses which eventually causes cracking.
OPTION B.Like most materials, the material glass expands when it gets warmer. When you place your thick glass in hot water, the outside of the glass gets hot right away. Glass is not good at transferring heat, so the inside of the glass gets hot later. Due to the thickness of the glass it takes some time until the warmth has reached the inner layer of the thick glass.
This uneven distribution of warmth causes the outer layer of your glass to expand first. Because the inner layer is not yet warm and does not expand yet, a strong tension is being created within the glass layer
OPTION D.Bimetallic strip works on the principle of unequal expansions A bimetallic strip is used to convert a temperature change into mechanical displacement a bimetallic strip, a strip made of two metals, brass and steel, joined together. When the temperature increases, both metals expand. However, brass expands more than steel.
A When hot water is poured into a thickly walled glass tumbler suddenly it develops cracks because of unequal expansions of the surfaces.
B For the use of hot liquids, thin-walled glass containers are preferred.
D Bimetallic strip works on the principle of unequal expansions.
OPTION A.Glass comes in the insulator class of material which means it is a poor conductor of heat. when you pour a very hot liquid into a thick tumbler what happens is, the surface of glass that comes in contact with the hot liquid heats up and expands as per its coefficient of thermal expansion, while the outer layer still remain cold and does not expands (because glass is a poor conductor and does not carry heat quickly). This leads to development of thermal stresses which eventually causes cracking.
OPTION B.Like most materials, the material glass expands when it gets warmer. When you place your thick glass in hot water, the outside of the glass gets hot right away. Glass is not good at transferring heat, so the inside of the glass gets hot later. Due to the thickness of the glass it takes some time until the warmth has reached the inner layer of the thick glass.
This uneven distribution of warmth causes the outer layer of your glass to expand first. Because the inner layer is not yet warm and does not expand yet, a strong tension is being created within the glass layer
OPTION D.Bimetallic strip works on the principle of unequal expansions A bimetallic strip is used to convert a temperature change into mechanical displacement a bimetallic strip, a strip made of two metals, brass and steel, joined together. When the temperature increases, both metals expand. However, brass expands more than steel.
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