#packaging

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How bubble wrap cushions an impact

Bubble wrap cushions an object by letting sealed air pockets compress when a force arrives. That deformation can spread the contact and give the object more distance over which to slow down. The bubbles do not make impact energy disappear; the packaging changes how the force reaches the protected surface.

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objects

How a screw lid turns rotation into a seal

A screw lid follows matching spiral threads on a container's neck. Turning the lid moves it downward, pressing its sealing surface against the rim. The threads provide the closing force, while a liner, gasket or shaped sealing surface blocks the gaps through which liquid or air could otherwise pass.

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