#surfaces | Noutez

Why a free soap bubble tends to become round

A free soap bubble tends towards a sphere because surface tension favours reducing its surface area. For a given enclosed volume, a sphere has the smallest surface area. Gravity, airflow or contact with another surface can distort that shape, so real bubbles are not always perfect spheres.

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objects

Why hook-and-loop fasteners stick without glue

A hook-and-loop fastener joins two surfaces by catching tiny hooks in a field of small loops. Pressing the strips together engages many catches at once; peeling them apart releases catches along a moving edge. This mechanical connection can be reopened and closed without applying fresh adhesive.

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moon

Why the Moon preserves so many impact craters

The Moon lacks the rain, flowing rivers and active plate tectonics that erase many old surface features on Earth. Impact craters can therefore remain visible for extremely long periods. They still change through later impacts and other processes, but the lunar surface preserves a much longer exposed record in many places.

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