Question

What happens to an amount of water when its temperature is reduced from 8°C to 4°C? Its density increses

its density decreases

its density remains a constant

it vaporizes

Answer 1

Using the equation of density.

$\rho =\frac{m}{v}$

And using the ideal gas equation

$P*v=n*R*T$

$v=\frac{n*R*T}{P}$

If the temperature decreases , the volume decreases . and introducing this value in the equation of density , density tends to increase. Therefore the density increases .