Ben Brugman wrote:
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Usually, the compact camera has a sealed sensor, making it very
difficult for dust or dirt to get in. You might like to post a
picture so that

The volume of the most compact camera's is NOT constant.
Air presure is not constant.
The space in front of the sensor is air.
(Compact camera's do not have a sealed sensor).

The sensor is sealed. Period. The air round the sensor is not, as you
say.

David