Dictionary Home »
Science » filter
filter science definition
- A material that has very tiny holes and is used to separate out solid particles contained in a liquid or gas that is passed through it.
- A device that allows signals with certain properties, such as signals lying in a certain frequency range, to pass while blocking the passage of others. For example, filters on photographic lenses allow only certain frequencies of light to enter the camera, while polarizing filters allow only light polarized along a given plane to pass. Radio tuners are filters that allow frequencies of only a narrow range to pass into an amplification circuit.
Learn more about filter