When the radius of a metal plate increases on heating, it is known as _________ expansion.

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Solution

Metal plate is a solid and solids have a definite shape and definite volume due to their closely packed arrangement.
So, when solids are heated, they gain energy to move freely and expand.
The expansion can be there in length, area, and volume leading to linear, superficial, and volume thermal expansions respectively.
So, if the radius of a metal plate increases on heating, the area will increase leading to superficial expansion.
Therefore, when the radius of a metal plate increases on heating, it is known as superficial expansion.

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