Scuba divers use a homemade depth gauge – a small narrow glass tube sealed at one end.

Scuba divers use a homemade depth gauge – a small narrow glass tube sealed at one end. What part of the tube will be filled with water at a depth of 20 m? (The water temperature is considered constant, atmospheric pressure is normal)

Let’s remember the formula for finding:

PV / T = const;

V2 = 20 m;

Let’s use one more formula:

P2 = Patm + Pwater;

P2 = po * g * h + 101 kPa;

P2 = 1000 * 9.8 * 20 + 101000;

P2 = 196000 + 101000;

P2 = 297000 Pa;

Find P1:

P1 = 101000 Pa;

101000 * V1 = 297000 * V2;

V2 = 0.34 * V1;

Answer: 0.34