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I believe it's the space between the molecules that make up the substance that changes, as well as their shape and how they bond together.
When there's more space between the molecules, then the substance expands, and when there is less space between them it contracts.
Certain conditions can cause a substance to change the way the molecules bind together. For example, water expands when frozen - when it's liquid, the molecules are close together, but when frozen, the shape of the molecule changes and it can't bunch together as closely, so it takes more space, but the substance still has exactly the same amount of mass, or "stuff", as before.
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ViviDensity will only stay the same if they decrease in the same proportion. And that is because definition of density is the quotient of the mass divided by the volume.
If you have 10 mass units and they occupy 20 volume units and you reduce both so you have 8 mass units and 16 volume units the quotient will remain the same:
10 / 20 = 8 / 16 = 0.50 the density of 0.50 remains constant.
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What is happening to the substances mass and volume to cause this decrease in density?
As the mass of a substance increases while its volume stays constant, its density will also increase. Conversely, if the mass of the substance stays constant while its volume increases, the density will decrease. This is because density is directly proportional to mass and inversely proportional to volume.
What happens to the density of an object if the mass increases but the volume stays the same?
If the volume remains the same, the density will increase in direct proportion to the increase in mass.
If mass increases and volume stays the same then density decreases?
No, if mass increases and volume stays the same, the density would actually increase. Density is calculated by dividing mass by volume, so if mass increases while volume remains constant, the density of the object would go up.
Does density increase decrease or stay the same if temp and mass of a liquid increase?
Depends on the other conditions. If the volume remains constant, the density will remain the same (but the pressure will increase). If the pressure remains constant, the volume will increase - and therefore the density (mass / volume) will decrease.
Explain what will happen to the mass volume and density of a liquid as the temperature increases?
As temperature increases, the volume of a liquid generally expands due to increased kinetic energy of the molecules causing them to move farther apart. The mass of the liquid remains the same. Consequently, the density of the liquid decreases because density is mass divided by volume, and with volume increasing and mass remaining constant, density decreases.
