Question

si unit of superfical expansion​

Answer 1

Thermal expansion refers to a fractional change in size of a material in response to a change in temperature. For most materials, over small temperature ranges, these fractional changes… uses the SI unit inverse kelvin (K−1 or 1/K) or the equivalent acceptable non SI unit inverse degree Celsius (°C−1 or 1/°C).

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Answer 2

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Here's your answer ⏎

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Two factors responsible for migration are:

MARRIAGE ✍

✏ Marriage is a very important social factor of migration. In rural areas most of the girls have to migrate to there in law's place of residence after marriage.

EDUCATION ✍

✏ Rural areas,by and large, lack educational facilities, especially those of higher education and rural people have to migrate to the urban centres for this purpose.

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