The density of water changes at different temperatures. As temperature goes up, density goes down.
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Yes. Density is mass/volume so if mass increases so does density if volume does not change
Density = mass / volume. So if the volume changes, the density will obviously also change.
Density = mass / volume, so to change density you need to change the mass within a fixed volume or the volume of a fixed mass. Increasing the mass or decreasing the volume will increase the pressure by a linear degree, so no, the density of a gas is very easy to change. E.G.: Decreasing the volume by 1.0% will increase the density by 1.1%. Increasing the mass by 1.0% will increase the density by 1.0%.
To calculate the water difference when the density changes, you would need to account for the change in volume due to the density change. Use the formula: Difference in water volume = Original water volume / Original water density - Original water volume / New water density. Multiply this difference in volume by the new water density to obtain the actual water difference.
Gases have the property of indefinite shape and volume, as they expand to fill any container. They also have low density compared to liquids and solids. Gases can be compressed and expand easily when heated.