If you think of how waterproof an electronic device is in relation to a free body diagram, at what force/psi is the water trying to get in at the seems of the device, for example a phone.

Question

In other words, what’s the force required at a seem or between two flat surfaces to make a device waterproof?

Also, im assuming that as you dive deeper under water, the force of the water seeping into the phone increases, but is there some sort of function/equation to predict that increase?

I understand that waterproof seals are a simple concept, but my intention is to understand all the forces at play in a mathematical way.

In: Physics

Answer 1

The pressure in Pascals at a given depth in a liquid is given by:

Pressure = depth × density × gravitational field strength(g)

For water density is 1000 (because this is in kg per cubic metre, not grams per cubic centimetre).
For Earth g is 9.81.