1.)heat it up
2.) change the pressure to less
3.)lessen the amount of space it takes up
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Density can be decreased by increasing the volume of an object while keeping its mass constant. This can be achieved by spreading out the particles or components within the object more widely, thus reducing the amount of mass per unit volume.
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.
The two main factors that affect density are the mass of an object and its volume. An increase in mass or a decrease in volume will lead to an increase in density, whereas a decrease in mass or an increase in volume will result in a decrease in density.
The density of a substance will generally decrease as temperature increases, as the particles within the substance will have more energy and move farther apart.
The surface energy decreases with an increase in planar density. This is because a higher planar density means more atoms are closely packed together, leading to a decrease in the number of surface atoms and therefore a decrease in surface energy.
If the pressure in a fluid is changed, its density is typically affected. In general, an increase in pressure leads to an increase in density, while a decrease in pressure results in a decrease in density.