What is the definition of bouyancy error?
Answer:
Archimede's Principle states a body experiences a loss in weight equal to the weight of the medium it displaces. This principle explains why ships float and balloons rise. It also explains why the weight of an object is affected by the environment in which it is weighed.
During most weighings the environment surrounding the weighing apparatus is air. The actual density of air may be calculated, but can be taken to be approximately 1.20 kg/m3.
In most industrial countries of the world, balances and scales are calibrated using weights calibrated with air with an apparent density of 8000 kg/m3. If you then use this balance to weigh objects with a different density, an air buoyancy error will be introduced.
Obviously, this error is relatively small, and for most weighings can be ignored. However, for weighings of a very high accuracy, this error must be accounted for. The error will also be introduced in weighings at different times when the air density conditions change.
To correct for the effects of air buoyancy (see the reference)
ref: http://members.shaw.ca/measurementbc/buo...
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