A number of factors have to be considered, the state of the substance, solid, gas or liquid.
The condensation and freezing point of the substance.
The temperature inside the freezer.
The pressure
Most, but not all, substances reduce in volume and increase in density when cooled. Water for instance, reduces in density when frozen.
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When a substance is placed in a freezer, it usually contracts and decreases in volume. This is because the colder temperature causes the particles in the substance to slow down and come closer together, resulting in a decrease in the overall volume of the substance.
The air inside the balloon will contract and the balloon will deflate due to the decrease in temperature causing the air molecules to slow down and decrease in volume.
If the mass of a substance is doubled while its volume remains constant, the density will also double. This is because density is calculated by dividing mass by volume, so increasing the mass while keeping the volume the same will result in a higher density.
When a balloon is placed in the freezer, the air inside it contracts and decreases in volume due to the cold temperatures. The rubber of the balloon becomes less flexible in the cold, making it so the balloon can't stretch to accommodate the reduced air volume inside. This increase in pressure causes the balloon to burst.
If the mass of a substance is cut in half but the volume remains the same, the density of the substance would also be cut in half. This is because density is calculated by dividing mass by volume, so reducing the mass will directly affect the density without changing the volume.
When you divide the mass of a substance by its volume, you get its density. Density is a physical property that describes how compact a substance is, or how much mass is contained in a given volume.