When measuring the density of a substance why would it be important to record the temperature of the substance?

Answer 1

Density is dependent on temperature. Because there is no device which can measure density directly, temperature is used in the measure for density.

Basically temperature, volume, and pressure are directly linked. Any change in one, immediately and directly affects the other two. Density is one of the results of the combination of all 3. Every material has a density. An object made of wood, steel, caking icing, vegetables, etc. Each material has a specific molecular pattern. The molecules are moving around inside the material. Because these molecules are attracted to each other, the material can exist without falling apart. Even water, is still water when is splashes on the ground. After the splash, there are simply many smaller pieces of water scattered around. Density is how tightly these molecules are attracted to each other, and they create a specific volume. Pressure can be thought of the speed at which each molecule inside the material moving. Finally, temperature can be thought of as the energy behind the motion. As temperature changes, the molecule either loses or gains energy. The change in energy means faster motion. Therefore, because the volume is not 100% contained, it increases as the pressure increases until equilibrium. As pressure and volume change, density changes because density is a given pressure at a given volume at a given temperature for a given material.

Answer 2

As temeprature changes the volume changes. An example ar emetals which expand when heated and contract when cooled. The mass is unchanged by heating or colling, so the density changes. Density is fond by dividing mass by volume:- mass/volume

Answer 3

• Heating a substance causes molecules to speed up and spread slightly further apart, occupying a larger volume that results in a decrease in density.
• Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density.

Answer 4

It is very important. When temperatures change, so does the density.