SI units: Difference between revisions
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SI units are now the general fundamental units for scientific work. The main basic units with which you will be concerned are the meter (m), the gram (g) and the second (s). Other non-SI units, notably minute (min), hour (h), degree Celsius (°C) and litre (l) are still commonly used in science, and will be used in this manual frequently. When using abbreviations, never add the letter "s" in an attempt to signify plurals. Below are some of the common symbols: | |||
{| width="200" border="1" align="center" cellpadding="1" cellspacing="1" | {| width="200" border="1" align="center" cellpadding="1" cellspacing="1" | ||
|- | |- | ||
| Symbol | | Symbol | ||
| Prefix | | Prefix | ||
| Factor | | Factor | ||
|- | |- | ||
| c | | c | ||
| centi | | centi | ||
| 10<sup>-2</sup> | | 10<sup>-2</sup> | ||
|- | |- | ||
| m | | m | ||
| milli | | milli | ||
| 10<sup>-3</sup> | | 10<sup>-3</sup> | ||
|- | |- | ||
| μ | | μ | ||
| micro | | micro | ||
| 10<sup>-6</sup> | | 10<sup>-6</sup> | ||
|- | |- | ||
| n | | n | ||
| nano | | nano | ||
| 10<sup>-9</sup> | | 10<sup>-9</sup> | ||
|- | |- | ||
| p | | p | ||
| pico | | pico | ||
| 10<sup>-12</sup> | | 10<sup>-12</sup> | ||
|} | |} | ||
<br> | <br> | ||
(1 l = 10<sup>3</sup> ml = 10<sup>6</sup> μl, 1g = 10<sup>3</sup> mg = 10<sup>6</sup> μg) | (1 l = 10<sup>3</sup> ml = 10<sup>6</sup> μl, 1g = 10<sup>3</sup> mg = 10<sup>6</sup> μg) | ||
<br>The units of amount of substance, [[ | <br>The units of amount of substance, [[Mole|mole]] (mol), and concentration of substance [[Molarity|molar]] (M) are also frequently used, and '''YOU MUST KNOW THE DIFFERENCE''' between them. <br> | ||
Revision as of 19:33, 27 July 2010
SI units are now the general fundamental units for scientific work. The main basic units with which you will be concerned are the meter (m), the gram (g) and the second (s). Other non-SI units, notably minute (min), hour (h), degree Celsius (°C) and litre (l) are still commonly used in science, and will be used in this manual frequently. When using abbreviations, never add the letter "s" in an attempt to signify plurals. Below are some of the common symbols:
| Symbol | Prefix | Factor |
| c | centi | 10-2 |
| m | milli | 10-3 |
| μ | micro | 10-6 |
| n | nano | 10-9 |
| p | pico | 10-12 |
(1 l = 103 ml = 106 μl, 1g = 103 mg = 106 μg)
The units of amount of substance, mole (mol), and concentration of substance molar (M) are also frequently used, and YOU MUST KNOW THE DIFFERENCE between them.