Question

define chemical change and thermal expansion in short​

Answer 1

Explanation:

Thermal expansion changes the space between particles of a substance, which changes the volume of the substance while negligibly changing its mass (the negligible amount comes from energy-mass equivalence), thus changing its density, which has an effect on any buoyant forces acting on it.

Answer 2

Answer:

hey dear your answer is here.....

Explanation:

chemical change -

chemical change occur when a substance mixed with another substance to make a new substance is called chemical change.

thermal expansion -

thermal expansion is the tendency of matter to change its shape , volume and density in response to a change in temperature.......

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