#pressure | Noutez

What pushes a drink up a straw

When you drink through a straw, you lower the pressure inside your mouth and the straw. Atmospheric pressure acting on the drink's exposed surface then pushes liquid upward towards that lower-pressure region. The straw works because of this pressure difference, not because liquid is pulled upward by an invisible hook.

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objects

Why a pressure cooker cooks above water's usual boiling point

A pressure cooker traps steam, raising the pressure inside its sealed pot. Higher pressure raises water's boiling temperature, allowing the contents to cook hotter than they would in an open pot at the same altitude. The lid's seal and pressure regulator make this controlled environment possible.

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spacesuits

Why a spacesuit must hold pressure

A spacesuit provides a pressurised environment as well as oxygen. In the near-vacuum of space, oxygen alone is not enough: the body needs adequate surrounding pressure for normal function. The suit also manages heat and supports movement, making it closer to a small wearable spacecraft than ordinary protective clothing.

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