# Measurements

Q:

## What is the relationship between mass and density?

A:

Density and mass are mutually dependent physical properties, with density being equal to the amount of mass per unit of volume of any particular object or substance. The mass of any object depends entirely on its overall density, with denser objects having greater mass, for the same volume, than less-dense objects. The mass of an object with uniform composition changes if pieces are added or removed, but its density remains constant. Meanwhile, barring any melting or evaporation, the density of an object tends to change with changes in temperature, while the mass remains the same.

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• #### Q:How much does one gallon of milk weigh in pounds?

A: According to the USDA, a gallon of milk weighs about 8.6 pounds. A quart of milk weighs about 2.15 pounds.
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• #### Q:How many grams does a dollar bill weigh?

A: According to the U.S. Bureau of Engraving and Printing, a dollar weighs one gram. This is the same weight for every denomination of a U.S. note.
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• #### Q:What is longer: a mile or a kilometer?

A: A mile is equal to 1.609 kilometers, and is therefore longer than a kilometer. To convert miles to kilometers, simply multiply the number of miles by 1.609. To convert kilometers to miles, multiply the number of kilometers by 0.6214 or divide by 1.609.
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• #### Q:What is the standard width of a fabric bolt?

A: The standard widths for fabric bolts include 36, 38, 42, 44/45, 48, 54, 58, 59, 60, 72 and 108 inches, with 45, 54 and 60 inches being the most common. The width is often listed on a label at the end of a flat fabric bolt.
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• #### Q:What are the dimensions of a traffic light?

A: There are two traffic signal sizes, differentiated by their approximate lens diameter, 8 inch or 12 inch. The 8-inch traffic signals are approximately 30 inches tall, 9.5 inches wide and 6 inches deep. The 12-inch signals are 42 inches tall, 13.5 inches wide and 8 inches deep. These measurements apply to the main body of the signal without visors.
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• #### Q:How big is 1 acre?

A: One acre is equal to 0.0016 square miles. The value is also equivalent to 4,840 square yards, 43,560 square feet, 0.004047 square kilometers or 4,046.86 square meters.
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• #### Q:What unit is used to measure rainfall?

A: Rainfall is measured in either millimeters or inches. The specific unit of measurement used depends on the county. While rainfall is measured in inches in the United States, most countries in the world adopt the metric system and use millimeters or centimeters instead of inches.
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• #### Q:What is the opposite of the metric system?

A: Countries that don't use the metric system use imperial units, a legacy system based on ancient measurements. Feet, miles, gallons, quarts, pounds and ounces are all part of the imperial system. This system came from that used in Great Britain, standardized by the Weights and Measures Act of 1824.
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• #### Q:How far is a kilometer in miles?

A: One kilometer is equal to 0.6214 miles. Multiplying the number of kilometers by 0.6214 reveals the equivalent number of miles. For example, a 5-kilometer race is equal to approximately 3.11 miles; likewise a 10-kilometer race covers 6.22 miles.
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• #### Q:How is speed measured?

A: Measuring speed requires time (T) and a known distance (D). Using the formula distance = rate x time (D=R*T), one determines the average speed by dividing distance by time, or R = D/T. This method assumes the object being measured is already in motion.
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• #### Q:How much does a traffic light weigh?

A: Traffic signals made out of polycarbonate material, which is a composite plastic, weigh between 15 and 30 pounds depending on their size. Traffic signals made out of cast aluminum weigh a bit more, ranging from 30 to 50 pounds.
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• #### Q:How many barrels of oil are in a metric ton?

A: In the U.S., there are 7.33 barrels in a metric ton. There are 42 U.S. gallons in a barrel. Oil companies registered on the New York Stock Exchange report their oil production results in thousands of barrels, written as "Mbbl" or millions of barrels, written as "MMbbl."
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• #### Q:How much does a barrel of oil weigh?

A: A standard-size barrel filled with the most common oils (petroleum oil, crude oil or diesel fuel oils) weighs between 275 and 300 pounds. However, the weight of a barrel of oil varies based on the type of oil in the barrel and the size of the barrel.
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• #### Q:What are the dimensions of a record album cover?

A: Vinyl record album covers are usually 12 inches by 12 inches for LP albums. For singles, covers of 7 inches are common because of the format's smaller size. Records in the 78 rpm format were usually sold with 10 inch covers but are uncommon today.
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• #### Q:How many volts equal one amp?

A: Because these two terms measure two different aspects of electricity, it is not possible to convert between the two. Amperage is a measure of current flow past a given point, while voltage is the potential for current flow.
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• #### Q:What are the two systems of measurement?

A: The two major systems of measurement in use in the world are the U.S. Customary System of measurement and the International System of Units, commonly known as the metric system. The majority of the world uses the metric measuring system.
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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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• #### Q:How do you convert weights from lbs to kg?

A: To convert pounds to kilograms, the formula "lbs / 2.2 = kilograms" is used. Converting pounds to kilograms is not as complicated as doing other metric conversions, because both measurements are standard units of mass, the conversion is quite straightforward.
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• #### Q:What is the difference between a tablespoon and a teaspoon?

A: As a unit of measurement, a tablespoon is three times larger than a teaspoon. In the U.S., a tablespoon is equal to 0.5 fluid ounce, or 14.79 milliliters, while a teaspoon is equal to 0.17 fluid ounce, or 4.93 milliliters. In British Imperial measurements, a tablespoon is equal to 0.625 fluid ounce, or 17.76 milliliters, while a teaspoon is equal to 0.21 fluid ounce, or 5.92 milliliters.
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• #### Q:How many ounces are in a quart?

A: One quart is equal to 32 fluid ounces. A quart is the equivalent of 2 pints, and each pint has 2 cups. One cup is equal to 8 fluid ounces. Therefore, 1 quart is equal to 4 cups, and 4 cups multiplied by 8 fluid ounces is 32 fluid ounces.
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• #### Q:How do you calculate a room's maximum occupancy?

A: To calculate a room's maximum occupancy, determine factors such as the area of the room, the available space in the room, the number of useful exits and the height of the ceiling. Calculate a basic estimation of a room's maximum occupancy by dividing the available floor space in square feet by 36.
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