Question

A liquid causes a pressure of 300000 Pa on an object that is submerged at a depth of 30 m in the liquid? 

 

What is the liquid? 

Answer 1

The pressure of a liquid at a depth h is:

$p=\rho gh,$

where $\rho$ - the density of a liquid;

g - the gravitational acceleration.

To find out what is the liquid, we need to find its density:

$\rho=\frac{p}{gh}=\frac{300000}{9.8\cdot 30} \approx1000\space kg/m^3.$

Answer: the liquid is water.