Difference between revisions of "Unit"
(→Key Stage 3) |
(→About Units) |
||
| Line 95: | Line 95: | ||
===About Units=== | ===About Units=== | ||
: [[Unit]]s used in science mean the same thing everywhere. A metre is the same [[distance]] everywhere. | : [[Unit]]s used in science mean the same thing everywhere. A metre is the same [[distance]] everywhere. | ||
| − | : Without [[unit]]s a number doesn't mean anything | + | : Without [[unit]]s a number doesn't mean anything. |
: The [[unit]]s you should know are shown in the following table: | : The [[unit]]s you should know are shown in the following table: | ||
{| class="wikitable" | {| class="wikitable" | ||
Revision as of 14:02, 21 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 Celcius | 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 Celcius | 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 Celcius 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 Field Density | Teslas | milliteslas |
| Moles | Mol | |
| Concentration | Mol per decimeter cubed | |
| Light intensity | Lux |