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Density is the substance's mass. Per unit of volume. Its formula is. “density equals mass. divided by volume”. For liquids a relatively small change in temperature. can affect the density appreciably. But a pressure change must be quite. great to have a measurable effect. As the temperature increases. the density of liquids decreases. Because the intermolecular space in liquids. is not as sparse as in gases. and they are often incompressible. With high pressure. we can compress the gap that. normal pressure cannot close. albeit a little. This requires a large pressure change. No, we don't need a great pressure change. as gases can be compressed easily. Solids are not affected by pressure change. density does not change. Calibration is the process by. which a stated measure. a mass or a volume is checked for accuracy. Research labs that. don’t calibrate can end up with meaningless results. because they were based on inaccurate measurements.