Difference between revisions of "Unit"
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| − | |Magnetic | + | |Magnetic Flux Density |
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Revision as of 14:32, 28 March 2019
Contents
Key Stage 2
Meaning
A unit is an amount that we can use to give a number meaning.
About Units
- Without units a number doesn't mean anything. For example if you ask someone how far away is London and they say '150', that doesn't mean anything. 150 what? 150 camels away? 150 seconds away? 150 metres away? A unit gives the number meaning. Perhaps London is 150 kilometres away.
- The units you should know are shown in the following table:
| Measurement | Standard Unit | Other Units |
| Distance, Length, Width, Height | metres | millimetres, centimetres, feet, kilometres, miles |
| Time | seconds | minutes, hours, days, weeks, months, years |
| Temperature | degrees Celsius | degrees Faranheit |
| Mass | kilograms | grams |
| Area | metres squared | centimetres squared |
| Volume | metres cubed | millilitres, centimetres cubed, litres, millimetres cubed |
| Force, Weight | Newtons | Pounds, Ounces, Stone |
| Speed | metres per second | miles per hour, kilometers per hour |
Key Stage 3
Meaning
Units are quantities that give a number meaning.
About Units
- Units used in science mean the same thing everywhere. A metre is the same distance everywhere.
- Without units a number doesn't mean anything. For example if you ask someone how far away is London and they say '150', that doesn't mean anything. 150 what? 150 camels away? 150 seconds away? 150 metres away? A unit gives the number meaning. Perhaps London is 150 kilometres away.
- The units you should know are shown in the following table:
| Measurement | Standard Unit | Other Units |
| Distance, Length, Width, Height | metres | millimetres, centimetres, feet, kilometres, miles |
| Time | seconds | minutes, hours, days, weeks, months, years |
| Temperature | degrees Celsius | degrees Faranheit |
| Mass | kilograms | grams |
| Area | metres squared | centimetres squared |
| Volume | metres cubed | millilitres, centimetres cubed, litres, millimetres cubed |
| Force, Weight | Newtons | Pounds, Ounces, Stone |
| Speed | metres per second | miles per hour, kilometers per hour |
Key Stage 4
Meaning
Units are quantities that give a number meaning.
About Units
- Units used in science mean the same thing everywhere. A metre is the same distance everywhere.
- Without units a number doesn't mean anything.
- The units you should know are shown in the following table:
| Measurement | Standard Unit | Other Units |
| Distance, Displacement, Wavelength | metres | nanometres, micrometers, millimetres, centimetres, feet, kilometres, miles |
| Time | seconds | microseconds, milliseconds, minutes, hours, days, weeks, months, years |
| Temperature | degrees Celsius or Kelvin | degrees Faranheit |
| Mass | kilograms | micrograms, milligrams, grams, megagrams (ton) |
| Area | metres squared | centimetres squared |
| Volume | metres cubed | millilitres, centimetres cubed, litres, decimetres cubed |
| Force, Weight | Newtons | Pounds, Ounces, Stone, millinewtons, kilonewtons |
| Speed and Velocity | metres per second | miles per hour, kilometers per hour |
| Density | kilograms per metre cubed | grams per centimetre cubed |
| Angle | degrees | |
| Acceleration | metres per second per second | feet per second per second |
| Moment | Newton Metres | |
| Energy, Work Done | Joules | millijoules, kilojoules |
| Electrical Charge | Coulombs | microcoulombs, millicoulombs |
| Electrical Current | Amps | microamps, milliamps, kiloamps |
| Potential Difference | Volts | microvolts, millivolts, kilovolts |
| Resistance | Ohms | microohms, milliohms, kiloohms |
| Radioactivity | Becquerels | |
| Radiation Dose | Ohms | microsieverts, millisieverts |
| Frequency | Hertz | kilohertz, megahertz, gigahertz |
| Magnetic Flux Density | Teslas | milliteslas |
| Moles | Mol | |
| Concentration | Mol per decimeter cubed | |
| Light intensity | Lux |