You cannot. Volume and weight are two different characteristics and, according to basic dimensional analysis, conversion from one to the other is not valid.
If you had the density of the substance, you would be able to convert the volume to mass. But mass is not the same as weight. You would then need information about the strength of gravitational attraction at the location to convert the mass into weight.
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No. It may change its weight if weighed at varying depths.
That depends on the volume of the brick. Whatever its volume is, its weight underwater is(weight of the brick in air) minus (weight of an equal volume of water)
Bulk density = dry weight / volume, then by knowing the dry weight and bulk density we can calculate the volume.
weight and mass measures the volume
This question is impossible to answer as weight does not equate with volume when the nature of the material in the volume or weight is unknown