Define pressure. Give its SI unit.
The total force applied per unit area is called pressure.
Mathematically,
Pressure (P) = Force (F) / Area (A)
Its SI unit is pascal (Pa).
An egg sinks in freshwater but floats on a concentrated salt solution. Why?
We all know that upthrust = Vdg so, upthrust ∝ d
The density of the concentrated salt solution is higher than that of pure water. So, more upthrust is exerted by the salt solution than by pure water. Hence, the egg floats in it but not in pure water.