Question

If the atmospheric pressure is 76 cm of Hg at what depth of water in a lake the pressure will become 2 atmospheres nearly

Answer 1

since density of water = 1 and
g = 10 or 9.8
h = ?
$p = \gamma gh \: where \ \: gamma \: is \: water \: density \\ 2 = 1 \times g \times h \\ h = \frac{2}{g} \\ h = 0.2$