Unofficial and external sites are not endorsed by Southeastern Louisiana University.Converting metric units ppt When converting from a smaller unit to a larger unit - we always divide! Metric units are very nice to work with, since they are all multiples of ten (or a hundred, or one-tenth, etc) of each other. Parkinson |Ĭopyright © 2008 Southeastern Louisiana University | Metric Units Exercises | Main Lesson Page | Email Dr. In addition to the standard metric prefixes, the Ångstrom is also a commonly used unit that arises in measurements on the atomic scale: 1 µL= 1 microliter = 1 × 10 -6 liter = 0.000001 literįor further explanation of unit interconversion using the metric prefixes as conversion factors, visit the dimensional analysis page.1 kg = 1 kilogram = 1 × 10 3 gram = 1000 gram.1 cm = 1 centimeter = 1 × 10 -2 meter = 0.01 meter.For example, using the scientific notation value of the metric prefixes): The prefixes instantly convey how many decimal place moves are required of the numeric value. It can be used to remove ambiguous place-holding zeroes in measurments, so that the number of significant figures are properly represented.It can be used to keep the numeric value of measurements to reasonably-sized numbers, say between values of 0.01 to 100.
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Scaling the unit up or down when reporting measurements is good practice because: The metric prefixes can be employed to scale the base units so that they can represent anything from a very large numeric value (for example by using prefixes such as Exa, Tera, or Mega) to a very small numeric value (for exampleīy using prefixes such as Atto, Femto, or Pico). In addition to the base metric units, many other scientific quantities also employ this system of prefixes: Metric prefixes are listed below (The prefixes most-commonly used in chemistry are listed in red): A prefix represents a factor by which the base unit must be multiplied. To change the scale of the base units, prefixes are attached. Outside the United States, the word "meter" is spelled " metre" and the word "liter" is spelled " litre."
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The SI units are used to construct all other units (these are called derived units). The metric-based Système International or SI units are used to standardize the report or calculation of scientific quantities: It follows from dimensional analysis that 1.0 dm 3 = 1.0 L. The volume ( V) of a cube that has length ( l) = 1.0 cm, width ( w) = 1.0 cm, and height ( h) is given by: The liter is not the SI unit of volume Volume is a unit derived from length. This will be discussed in the section on prefixes. It is then necessary to subdivide or expand our measurement unit. The metric system uses the following base units:įrequently the above units are too small or more often too large to appropriately scale the measured quantity. The English System unit of mass is the slug, which when multiplied by the acceleration of gravity (32 ft/sec 2) gives the weight in pounds. Strictly speaking, weight is the force ( F) associated with a given mass ( m) as it is accelerated ( a) by gravity: The terms mass and weight are often used interchangebly in chemistry.
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