Chennai
Tides are measured from a datum called the Mean Sea Level
These days, elevations are measured from the Geoid model, which is a layer near sea level all of whose points have identical force of gravity. The old terminology that is still popular was "Mean Sea Level". ("Mean" is about the same as saying, "Average").
The level of its surface relative to the land. For mapping and other technical purposes the Mean Sea Level at a suitable reference location is used, to allow for the tides. I don't know the American equivalent, but for the UK the reference level is Mean Sea Level measured at Newlyn, Cornwall, as it is a convenient location little affected bycoastal features or the English Channel, Bristol Channel (the Severn Estuary), etc.
That is a missunderstanding. Decibels are never doubled. The ratio or the factor can be doubled.Doubling means the "factor 2". What does doubling of a "sound" mean?Doubling the (sound) intensity is obtained by an increase of the (sound intensity) level of 3 dB.Doubling the sound pressure is obtained by an increase of the (sound pressure) level of 6 dB.Doubling the loudness feeling is obtained by an increase of the (loudness) level of about 10 dB.
The UV level refers to the intensity of ultraviolet (UV) radiation from the sun at a particular location. It is typically measured on a scale from 1 to 11+, with higher levels indicating stronger and potentially more harmful UV exposure. It is important to pay attention to UV levels to protect your skin and eyes from sun damage.
A variable measured at the interval or ratio level can have more than one arithmetic mean.
mumbai
interval
Tides are measured from a datum called the Mean Sea Level
If you mean a 'spirit level' then when the line is in the center of the bubble then the object being measured is horizontal to the ground.
it is the highest part usable runway surface. Measured in feet above Mean Sea Level(MSL)
An altitude is measured from mean seal level on Earth. So asking what the planet's altitude is, is a nonsense question.
That you have been attacked by pirates.
Well, sea level is the standard by wich other things are measured, so zero is the answer. Sea level is sea level. Compared to what?
Sea level rises and falls, so a datum line was put by the British Ordnance Survey on a harbour wall at Newlyn, Cornwall. It is from this datum line that mean sea level is measured.
It means far away from the main cities on the coasts of Australia.
A Measured Variable is something that can be controlled.