Units of Measurements, Lecture notes of Acting

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Units of Measurements

Friday, June 30, 2017 3:09 PM SI Units to Know The standard units are kg not g, and meter for length Physical Quantity Name of Unit Abbreviation Mass kilogram kg Length meter m Time second s Temperature kelvin K Electric current ampere A Amount of substance mole mol Meter is denoted by a small ______ Prefixes Memorize Mega (capital M) down through pico. Prefix Symbol Meaning Exponent mega- M 1,000,000 106 kilo- K 1,000 103 hecto- H 100 102 deka- da 10 101 deci- d 0.1 10 -^1 centi- c 0.01 10 -^2 milli- m 0.001 10 -^3 micro- μ 0.000001 10 -^6 nano- n 0.000000001 10 -^9 pico- p 0.000000000001 10 -^12 femto f 0.00000000000001 10 -^15 atto- a 0.000000000000000001 10 -^18

UNITS OF MEASUREMENT

Wednesday, September 12, 2018 1:19 AM

atto- a 0.000000000000000001 10 -^18 Volume Not a fundamental SI unit; derived from length 1 mL = 1 cm^3 1 L = 1 dm^3 Two important relationships to know: Mass vs. Weight Mass is the amount of matter in an object. Weight is a measure of the force of gravity acting on an object's mass. Density Common density units = Temperature An expression of the average kinetic average contained within a sample. For most chemistry problems centigrade must be converted to Kelvin: Practice Problems: a. gram b. milliliter c. yard d. kilometer

1. A metric unit for length is a. nano-< milli-< centi-< kilo- b. milli-< nano-< centi-< kilo- c. kilo-< centi-< nano- < milli- d. kilo-< centi-< milli- < nano-
2. Order the four metric prefixes from smallest to largest a. 8.1 x 10^2 g b. 8.1 x 10^3 g c. 81 g d. 0.81g
3. 8.1 kilogram(s) contains this many grams a. 398.0 mm b. 3.90 x 10-^3 mm c. 3.980 x 10-^4 mm
4. Convert 0.3980 m to mm.