Description | Tens | Units | Decimal point | Tenths | Hundredths |
---|---|---|---|---|---|
4.5 is 4 units and 5 tenths | 0 | 4 | • | 5 | 0 |
6.87 is 6 units, 8 tenths and 7 hundredths | 0 | 6 | • | 8 | 7 |
98.04 is 9 tens, 8 units, 0 tenths and 4 hundredths | 9 | 8 | • | 0 | 4 |
0.06 is 6 hundredths | 0 | 0 | • | 0 | 6 |
Name | Number | Order of magnitude | Power | Unit | Symbol |
---|---|---|---|---|---|
Million | 1 000 000 | 6 | 10^{6} | mega | M |
Hundred thousand | 100 000 | 5 | 10^{5} | ||
Ten thousand | 10 000 | 4 | 10^{4} | ||
Thousand | 1 000 | 3 | 10^{3} | kilo | k |
Hundred | 100 | 2 | 10^{2} | hecto | h |
Ten | 10 | 1 | 10^{1} | ||
One | 1 | 0 | 10^{0} | ||
Tenth | 0.1 | −1 | 10^{−1} | deci | d |
Hundredth | 0.01 | −2 | 10^{−2} | centi | c |
Thousandth | 0.001 | −3 | 10^{−3} | milli | m |
Ten thousandth | 0.000 1 | −4 | 10^{−4} | ||
Hundred thousandth | 0.000 01 | −5 | 10^{−5} | ||
Millionth | 0.000 001 | −6 | 10^{−6} | micro | μ |
Ten millionth | 0.000 000 1 | −7 | 10^{−7} | ||
Hundred millionth | 0.000 000 01 | −8 | 10^{−8} | ||
Billionth | 0.000 000 001 | −9 | 10^{−9} | nano | n |
Quantity | Name | Symbol |
---|---|---|
Length | metre | m |
Mass | kilogram | kg |
Time | second | s |
Temperature | kelvin | K |
Electric current | ampere | A |
Luminous intensity | candela | cd |
Amount of substance | mole | mol |
Quantity | Derived unit | Symbol | SI units |
---|---|---|---|
Speed | metres per second | m s^{−1} | m s^{−1} |
Force | newton | N | m kg s^{−2} |
Energy | joule | J | m^{2} kg s^{−2} |
Volume | cubic metre | m^{3} | m^{3} |
Pressure | pascal | Pa | kg m ^{−1} s^{−2} |
Absorbed dose (radiation) | gray | Gy | m^{2} s^{−2} |
Equivalent dose (radiation) | sievert | Sv | m^{2} s^{−2} |
Radioactivity | becquerel | Bq | s^{−1} |
Quantity | Symbol | Non-SI unit | Conversion factors |
---|---|---|---|
Time | min | minute | 1 min = 60 s |
Time | h | hour | 1 h = 60 min = 3600 s |
Time | d | day | 1 d = 24 h = 1440 min = 86400 s |
Volume | 1 | litre | 1 l = 0.001 m^{3} |
Mass | t | tonne | 1 t = 1000 kg |
Energy | cal | calorie | 1 cal = 4.18 J |
Temperature | °C | Celsius | 1 °C = 274.15 K |
Pressure | mmHg | millimetres of mercury | 1 mmHg = 133.3 Pa |
Component | %RDA | Amount per tablet |
---|---|---|
Vitamin A | 100 | 800 μg |
Vitamin B6 | 100 | 2 mg |
Vitamin C | 100 | 60 mg |
Vitamin D | 100 | 5 μg |
Vitamin E | 100 | 10 mg |
Magnesium | 50 | 150 mg |
Drug formulation | Typical dose at any one time |
---|---|
Liquid | oral: 5-20 ml (1-4 teaspoons full) |
injection: generally 0.25-2 ml | |
subcutaneous: 1 ml or less | |
intramuscular: adults - up to 3 ml in large muscles | |
children and elderly - up to 2 ml | |
infants - 1 ml or less | |
Solid | 1-4 tablets |
Gas | 0.2-150 litres/min |
Radiation dose | 20-70 μSv for an X-ray, 100-200 Sv for radiotherapy |
Time of day | Patient temperature/°C |
---|---|
13:00 | 38.2 |
14:00 | 37.9 |
15:00 | 37.9 |
16:00 | 37.5 |
18:00 | 37.1 |
19:00 | 36.9 |
Graph type | Advantages |
---|---|
Bar and line | trends in data can be seen clearly (how one variable affects the other) |
Bar and line | easy to use the value of one of the variables to determine the value of the other variable |
Bar and line | enables predictions to be made about results of data you don't have yet |
Bar | best for 'discrete' variables (those that change in jumps, with no 'in between' values) |
Line | best for 'continuous' variables (those that change smoothly) |
Discussion 2019012600