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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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8y ago
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14y ago

Density 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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11y ago

If mass or volume is changed, the density (mass per volume) will also change.

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Q: If mass and volume decrease why does density stay the same?
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What will happen to the density if you keep the volume the same and you decrease the mass?

Density = mass / volume, so if you decrease the mass, you'll hve less density.


What is happening to the substances mass and volume to cause this decrease in density?

A decrease in density would indicate a reduction in mass relative to the volume. If the mass decreases but the volume remains the same or increases, then the density would decrease.


How does a change volume affect an objects density when mass stays the same?

With constant mass, a decrease in volume will increase the the density. Conversely, an increase in volume will decrease the density.


When a substance changes from a solid to a liquid its density normally decreases. What is happening to the substance's mass and volume to cause this decrease in density?

A decrease in density would indicate a reduction in mass relative to the volume. If the mass decreases but the volume remains the same or increases, then the density would decrease.


What happens to density if an object mass remains constant but its volume is decreased?

The density becomes lower: Density is defined as mass/volume, and if mass decreases while volume remains the same, the quotient must decrease.


If mass increases and volume stays the same then density decreases?

Density is mass / volume. Therefore, when mass decreases, density will also decrease.Density is mass / volume. Therefore, when mass decreases, density will also decrease.Density is mass / volume. Therefore, when mass decreases, density will also decrease.Density is mass / volume. Therefore, when mass decreases, density will also decrease.


What happens to the density as the volume increases?

If volume increases while mass remains the same, the density will decrease.


When mass decreases what does volume do?

Assuming you are talking about the same thing, this can be shown through the density equation: Mass = Density by volume. Assuming density stays the same, if mass decreases, volume should proportionally decrease


Will density decrease or increase if mass stays same but volume increases?

density decreases


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 you squeeze the foam you will increase its density why?

By squeezing the foam you are decreasing its volume, whereas its mass remains roughly the same. Therefor, as density is mass/volume, a decrease in volume results in and increase in density.


If volume stays the same and density decreases what will mass do?

The mass will decrease as well. There is a formula for calculating said change, M(mass) = D(density) x V(volume).So if the volume were to remain constant and the density were to decrease, then the result would be smaller, as I previously stated above.