Q:
# What is the ratio of mass to a volume of substance?

A:

**The ratio of mass to volume of a substance is called density.** Units of measure for density include kilograms per meter cubed and grams per centimeter cubed.

Density of a substance is a useful property as it determines whether the substance can float on water. If the density of a substance is less than the density of water, it floats on water; else, it sinks. The density of water is 1 gram per centimeter cubed. It is used as a standard in calculating relative densities of various substances. Relative density is defined as the ratio of the density of a substance to the density of water.

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Q:
## How do you convert 270 pounds to kilograms?

A:Converting from pounds to kilograms involves finding the conversion factor of 0.45 kilograms/pound and using this to create a conversion equation. Solving the equation (270 pounds)(0.45 kilograms/pound) supplies the answer of 121.5 kilograms.

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Q:
## What Is 15 kilograms converted to pounds?

A:Fifteen kilograms is equal to approximately 33.069 pounds. Since there are exactly 2.2046 pounds in 1 kilogram, simply multiply the value in kilograms by 2.2046 to obtain the value in pounds.

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Q:
## What is a bomb calorimeter used for?

A:A bomb calorimeter is used to determine the enthalpy of combustion of hydrocarbons. Bomb calorimeters are constant volume calorimeters that are used to determine the energy necessary for certain hydrocarbons to undergo a combustion reaction.

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Q:
## How many watts make one amp?

A:Power in watts equals amperes times voltage. So, in a direct current, 1 amp at 110 volts equals 110 watts, whereas 1 amp at 220 volts equals 220 watts.

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