Question

what is mean sea level how is it measured ​

Answer 1

Answer:

Sea level, position of the air-sea interface, to which all terrestrial elevations and submarine depths are referred. The sea level constantly changes at every locality with the changes in tides, atmospheric pressure, and wind conditions. Longer-term changes in sea level are influenced by Earth’s changing climates. Consequently, the level is better defined as mean sea level, the height of the sea surface averaged over all stages of the tide over a long period of time.Satellites can record the level of oceans around the globe, whiletide gauges are used to measure the height of water with respect to a fixed, nearby point on land. Oceanographers combine data from satellites and tide gauges to study global effects, like the rise in average sea level that results from climate change.

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Answer 2

Explanation:

SPECULATIVE SCIENCE. How exactly is sea level measured? THE STANDARD method of measuring is by means of instruments called tide gauges. Gauges exist in many ports and harbours around the world, and record the height of the rising and falling tide relative to a reference level, called a "benchmark", on the land nearby.