| for practical and automotive purposes. Most fluid mechanics problems using water approximate the compressibility coefficient at zero (incompressible). More info for the scientific minded: More accurately, the compressibility coefficient for water is 0.00005, measured as the compressibility per atmosphere of pressure. Therefore, at say, 3000 feet deep (about 100 atmospheres pressure), water will compress fractionally by 0.005. In more everyday terms, that means that the linear dimensions
of water (or a sack of water) will change by 0.17% as the water goes from the surface to 3000 feet deep. That is very little compression, and hence, water is described, as an approximation, as incompressible. You get the general idea ;c)
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