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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.
Density is a measure of how much mass is packed into a given volume. If both mass and volume decrease at the same rate, the ratio of mass to volume (density) remains constant. Therefore, even though both mass and volume are decreasing, the density remains the same.
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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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.
What will happen to the density if you keep the volume the same and you decrease the mass?
If you decrease the mass while keeping the volume constant, the density of the object will decrease. Density is calculated by dividing mass by volume, so a decrease in mass with a constant volume will result in a lower density.
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.
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.
Changing the mass or volume of an object changes its density and?
Changing the mass or volume of an object will alter its density. If mass increases and volume stays the same, density will increase. Conversely, if volume increases and mass stays the same, density will decrease.
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.
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 the density as the volume increases?
If volume increases while mass remains the same, the density will decrease.
How is density affected if the volume of an object increases but its mass stays the same?
If the volume of an object increases but its mass stays the same, the density of the object will decrease. This is because density is calculated by dividing mass by volume, so if the volume increases without a corresponding increase in mass, 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
When mass increase and volume states the same does density increase or decrease?
If mass increases while volume stays the same, then density will increase. Density is calculated by dividing mass by volume, so if mass increases and volume remains constant, the resulting density will be higher.
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.
