How does pressure change with depth in seawater?

Pressure in seawater is governed by the principle that for every increase in depth, the weight of the water above exerts additional pressure. Specifically, it increases by approximately 1 atmosphere (or about 14.7 psi) for every 10 meters of depth. This relationship is a fundamental aspect of hydrostatics, which applies to liquids like seawater.

As you descend into the ocean, the cumulative weight of the water above you adds to the pressure you experience. This increase in pressure is linear with depth, which is essential for divers to understand, as it affects various physiological responses, gas behavior in scuba tanks, and the buoyancy of equipment.

In contrast to the correct understanding, the other options suggest concepts that do not accurately reflect the behavior of pressure in water. The idea that pressure remains constant regardless of depth ignores the physical realities that govern fluid dynamics. Additionally, suggesting that pressure decreases with depth or fluctuates due to temperature fails to recognize the consistent relationship between depth and pressure increase in a fluid environment like seawater.