What is the SI base unit of length?
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Metre
1000 metres make a kilometre.
💡 Did you know? It is defined via the speed of light.
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What is the SI base unit of mass?
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Kilogram
It is the only base unit with a prefix.
💡 Did you know? It was once a metal cylinder in Paris.
What is the SI base unit of time?
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Second
60 seconds make a minute.
💡 Did you know? It is defined via a caesium atom.
What is the SI base unit of temperature?
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Kelvin
0 kelvin is absolute zero.
💡 Did you know? One kelvin equals one degree Celsius in size.
What is the SI base unit of electric current?
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Ampere
It is named after André-Marie Ampère.
💡 Did you know? Colloquially it's “amp”.
What is the unit of force?
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Newton
An apple weighs about one newton.
💡 Did you know? Named after Isaac Newton.
What is the unit of energy and work?
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Joule
Food energy is often given in kilojoules.
💡 Did you know? About 4.18 joules make one calorie.
What is the unit of power?
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Watt
A light bulb was often 60 watts.
💡 Did you know? Named after inventor James Watt.
What is the unit of pressure?
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Pascal
Air pressure is often given in hectopascals.
💡 Did you know? Named after Blaise Pascal.
What is the unit of frequency (oscillations per second)?
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Hertz
One hertz is one cycle per second.
💡 Did you know? Named after Heinrich Hertz.
In which unit are angles measured, with 360 in a full circle?
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Degree
A right angle is 90 degrees.
💡 Did you know? In maths one often uses radians.
In which unit is data measured (eight bits)?
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Byte
One byte is eight bits.
💡 Did you know? 1024 bytes make a kibibyte.
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