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How is temperaturę measured?

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Three temperaturę W A scales are commonly used for measuring temperaturę—Fahrenheit, Celsius, and Kelvin.

The Kelvin scalę W u begins at absolute zero, the coldest possible temperaturę, so it is mainly used by scientists.

Celsius and

wO Fahrenheit are used for everyday temperaturę measurement.

Celsius is morę

common in countries that use metric units.

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Coffins used to be madę to

measure. An undertaker measured a body and built a coffin specially for it. Today, coffins are madę in standard sizes.

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Astronomers use a unit of measurement called a light-year. It sounds like a measurement of time, but it actually measures distance. It is the distance light travels in one year—about 5.9 trillion miles (9.5 trillion km).

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Ruler

Measures length and is also used as a straight edge for drawing straight lines.

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Protractor

An instrument for measuring angles and setting out angles on paper.

Important

temperatures

	kelvin	celsius	fahrenheit j
absolute zero	0	-273.15	-459.67
water freezes	273.15	0	32
water boils	373	100	212

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Sextant

Measures angles between objects. In navigation, it figures out the angle between the horizon and the Sun or other stars.

Pyrometer

Measures high temperatures, especially in furnaces and pottery kilns.

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Ammeter

An instrument for measuring electric current in amperes, or amps.

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Many units are named after famous people, usually scientists who madę important discoveries in the field of science or technology in which the units are used.

James Watt

(1736-1819)

watt

power

Sir Isaac Newton

(1642-1727)

newton

force

Marie Curie

(1867-1934)

curie

radioactivity

Voltmeter

Measures the potential difference, or voltage, between two points.

Pedometer

When worn on the body, it measures the distance that a person walks or runs.

Dynamometer

An instrument for measuring muscle strength or the power of an engine.

James Prescott Joule

(1818-1889)

joule

energy

Blaise Pascal

(1623-1662)

pascal

pressure

Anemometer

Measures wind speed by means of a set of cups or a windmill that spins in the wind.

Measuring