Science explained

Pressure in air and liquids

Pressure is force distributed over area, and it helps explain atmospheric effects, hydraulics and why fluids push in all directions.

PhysicsPressure

Editorial review: August 12, 2026 · Julian E. Marston

Smaller area can mean larger pressure

The same force concentrated on less area produces greater pressure.

Atmospheric pressure comes from air

Air has mass and its molecules collide with surfaces.

Liquid pressure changes with depth

Deeper fluid has more fluid above it, increasing pressure.

Pressure differences drive flow

Air and liquids move in response to pressure differences when pathways are available.

This page explains scientific concepts for general learning. It does not replace laboratory safety procedures, professional engineering guidance, or individualized medical advice.