Question

State the effect of temperature on density of a substance.

Answer 1

Hint: Before answering the question let us first talk about density. The density of a given volume or amount of space is a measure of how much mass it contains. The density of any material is determined by dividing the mass of the substance by its thickness.
$Density = \dfrac{{Mass}}{{Volume}}$

Complete answer:
As a substance is heated, molecules speed up and spread slightly wider apart, taking up more space and resulting in a decrease in density.
As a material is cooled, molecules slow down and move closer together, resulting in a smaller volume and an increase in density.
Hot water is less dense than room-temperature water and can float.
In room-temperature water, cold water is denser and sinks.
The more space water takes up and the lower its density, the colder it is. When two samples of water with the same salinity or mass are compared, the water sample with the higher temperature has a larger volume and therefore is less dense.
So from the above discussion we can say that as we increase the temperature the volume of the substance also increases and as we decrease the temperature the volume of the substance decreases. So we can say a relation between density temperature and volume:
$Density = \dfrac{1}{{volume}} = \dfrac{1}{{temperature}}$.

Note:
It has been found that the majority of people interpret the relationship in the exact opposite way than the correct response. They can write their response as if density and temperature are directly proportional, which is not the case. To avoid making such a blunder, remember that density is inversely proportional to volume, which means that temperature would be inversely proportional to density as well.