Measurement-Chemistry

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Base unit Noun

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[bays yoo-nit]

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Base unit

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A defined unit in a measurement system that is based on a physical object or event and is independent of other units.

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Example: This image lists the seven fundamental SI base units, such as the meter for distance and the kilogram for mass, from which all other measurement units are derived.

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Second (s) Noun

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[sek-uhnd]

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Second (s)

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The SI base unit for time, which is defined by the frequency of radiation given off by a cesium-133 atom.

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Example: This stopwatch icon visually represents a second (sec) as the fundamental unit for measuring time, a key concept in scientific measurements like reaction rates.

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Mass Noun

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[mas]

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Mass

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A fundamental property of matter that is a quantitative measure of the amount of substance an object contains.

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Example: This image shows a balance scale comparing a rock and a feather. The scale tips towards the rock, visually demonstrating it has more mass.

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Kilogram (kg) Noun

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[kil-uh-gram]

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Kilogram (kg)

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The SI base unit for mass, which is the standard for measuring the amount of matter in an object.

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Example: This image shows a pumpkin on a weighing scale, with a close-up of the dial indicating its mass is 4 kilograms (kg).

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Temperature Noun

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[tem-per-uh-cher]

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Temperature

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A quantitative measurement of the average kinetic energy of the particles that make up an object or substance.

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Example: This image shows a thermometer with both Celsius and Fahrenheit scales, the standard instrument used to measure temperature.

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Fahrenheit scale Noun

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[fair-en-hahyt skeyl]

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Fahrenheit scale

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A temperature scale on which water freezes at 32 degrees and boils at 212 degrees under standard atmospheric pressure.

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Example: This diagram of a thermometer shows the Fahrenheit scale, marking the key reference points where water freezes (32°F) and boils (212°F).

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Celsius scale Noun

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[sel-see-uhs skeyl]

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Celsius scale

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A temperature scale on which water freezes at 0 degrees and boils at 100 degrees under standard atmospheric pressure.

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Example: This diagram shows key reference points on the Celsius scale: water's freezing/melting point at 0°C and its boiling point at 100°C.

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Kelvin (K) Noun

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[kel-vin]

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Kelvin (K)

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The SI base unit for temperature, where zero kelvin represents absolute zero, the point of lowest possible energy.

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Example: This diagram compares the Kelvin and Celsius temperature scales, showing that 0 K is absolute zero and how it relates to water's freezing (273 K) and boiling (373 K) points.

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Derived unit Noun

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[dih-rahyvd yoo-nit]

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Derived unit

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A unit of measurement that is defined by a combination of two or more fundamental SI base units.

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Example: This table shows how derived units, like the unit for velocity (m/s), are created by combining fundamental SI units, such as meters (m) and seconds (s).

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Volume Noun

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[vol-yoom]

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Volume

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A measure of the three-dimensional space occupied by an object, substance, or enclosed within a container.

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Example: This image shows how to calculate the volume of a rectangular prism by multiplying its length, width, and height, demonstrating a key measurement skill.