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Basic Sciences - Measurement Units

Study terms for metric and imperial units used to measure mass, length, area, volume, electricity, frequency, energy, and power.

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ounce
ounce
[noun]

a unit for measuring weight equal to approximately 28.34 grams

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pound
pound
[noun]

a unit for measuring weight equal to 16 ounces or 0.454 kilograms

Ex: She bought a pound of coffee beans to grind fresh for her morning cup of coffee. 
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carat
carat
[noun]

a unit of weight used for measuring gemstones and pearls, equal to 200 milligrams or 0.2 grams

Ex: The diamond necklace featured a centerpiece gemstone weighing 3 carats, showcasing its brilliance and rarity. 
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milligram
milligram
[noun]

a unit of measuring weight that equals one thousandth of a gram

Ex: The vitamin supplement contains 50 milligrams of calcium. 
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gram
gram
[noun]

a unit of measuring weight equal to one thousandth of a kilogram

Ex: The package weighs 500 grams. 
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kilogram
kilogram
[noun]

a unit of measuring weight equal to 2.20 pounds or 1000 grams

Ex: The bag of rice weighs 5 kilograms. 
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ton
ton
[noun]

a unit for measuring weight that is used in the US and is equal to 907.19 kg

Ex: The truckload of gravel weighed approximately 5 tons. 
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gallon
gallon
[noun]

a unit used to measure liquids in the United States, equivalent to approximately 3.785 liters

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milliliter

a unit for measuring the quantity of a liquid or gas that equals one thousandth of a liter

Ex: The baby bottle can hold up to 250 milliliters of formula. 
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centiliter

a metric unit equal to 1/100th of a liter

Ex: Students had to weigh and record the volume of 10 centilitres of water for a science experiment. 
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liter
liter
[noun]

a unit for measuring an amount of liquid or gas that equals 2.11 pints

Ex: She drank half a liter of orange juice. 
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mile
mile
[noun]

a unit of measuring length equal to 1.6 kilometers or 1760 yards

Ex: The marathon route is 26.2 miles long. 
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foot
foot
[noun]

a unit of measuring length equal to 12 inches or 30.48 centimeters

Ex: The length of the room is 15 feet. 
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yard
yard
[noun]

a unit of length that is equal to 91.44 centimeters or 36 inches

Ex: The football field is 100 yards long. 
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inch
inch
[noun]

a unit of length equal to one-twelfth of a foot or 2.54 centimeters

Ex: The nail was just an inch long, but it was enough to puncture the tire. 
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acre
acre
[noun]

a unit used in North America and Britain for measuring land area that equals 4047 square meters or 4840 square yards

Ex: A typical soccer field covers about 1.5 acres. 
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hectare
hectare
[noun]

a land measurement unit that equals 10000 square meters or 2471 acres

Ex: A hectare is a unit of area equal to 10,000 square meters or approximately 2.47 acres. 
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nanometer
nanometer
[noun]

a unit of length in the metric system equal to one billionth of a meter

Ex: DNA strands are about 2.5 nanometers in width. 
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millimeter

a unit of measuring length equal to one thousandth of a meter

Ex: The diameter of the wire is measured in millimeters. 
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centimeter

a unit of measuring length equal to one hundredth of a meter

Ex: The baby's height was measured in centimeters at the doctor's office. 
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meter
meter
[noun]

the basic unit of measuring length that is equal to 100 centimeters

Ex: The length of the room is 5 meters. 
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kilometer
kilometer
[noun]

a unit for measuring length that is equal to 1000 meters or approximately 0.62 miles

Ex: The marathon route spans 42.195 kilometers. 
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volt
volt
[noun]

the standard unit of electromotive force, which measures the strength of an electrical current that is sent around an electrical system

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watt
watt
[noun]

the standard unit for measuring electrical power corresponding to the rate of energy consumption in an electric circuit, equal to one joule per second

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kilowatt
kilowatt
[noun]

(physics) a unit of power equal to 1,000 watts

Ex: A typical electric oven uses about 3 kilowatts of power when running. 
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megawatt
megawatt
[noun]

(physics) a unit of power equal to one million watts

Ex: A large wind turbine can generate up to 3 megawatts of electricity. 
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milliampere

(physics) a unit of electric current equal to one thousandth of an ampere

Ex: The LED draws only 20 milliamperes of current to produce bright light. 
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ampere
ampere
[noun]

the unit of electric current, symbolized as "A" in the International System of Units

Ex: The circuit was designed to handle a maximum current of 10 amperes to ensure safety. 
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hertz
hertz
[noun]

a unit that is used in measurement of the frequency of sound and radio waves

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kilohertz
kilohertz
[noun]

(physics) a unit of frequency equal to one thousand cycles per second

Ex: AM radio stations typically broadcast at frequencies between 530 and 1700 kilohertz. 
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megahertz
megahertz
[noun]

a unit that is used to measure the frequency of a radio wave which is equal to 1 million Hertz

Ex: The radio station broadcasts on a frequency of 101.5 megahertz. 
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calorie
calorie
[noun]

(physics) a unit of energy equal to the amount of heat needed to raise the temperature of one gram of water by one degree Celsius

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horsepower

a unit for measuring an engine's power

Ex: Horsepower is a unit of power used to measure the rate at which work is done. 
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metric
metric
[noun]

a decimal unit of measurement belonging to the metric system, based on meters, kilograms, and seconds

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