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### 48 Cards in this Set

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 Mass (not weight) kilogram (kg) Length meter (m) Temperature kelvin (K) Time second (s) Pure substance amount mole (mol) Electric current ampere (A) Light brightness (wavelength) candela (cd) tera (T) 10^12 giga (G) 10^9 mega (M) 10^6 kilo (k) 10^3 deca (da) 10^1 deci (d) 10^-1 centi © 10^-2 mili (m) 10^-3 micro (u) 10^-6 nano (n) 10^-9 pico (p) 10^-12 Significant figures the number of digits written after the decimal point to measure a quantity 9.107 4, zero in the middle is significant 401 3, zero in the middle is significant 0.006 1, leading zeros are never significant 800 km 3, zeros are significant in measurements unless otherwise indicated 3.002 in 4, zeros in the middle of non-zero digits are significant 0.096 2 13.42 cm 4 0.0027 2 0.000001002 4 0.00000004 4 x 10^-8 40 lb potatoes x \$0.45 per lb = \$18.00 \$18 since the first number is only measured in two places Precision The closeness of two sets of measured groups of values. Scientific method A logical approach to solving problems by observing and collecting data, forming a hypothesis, testing it, theories and a conclusion. System A specific portion of matter in a given region of space that has been selected for experiments or observation. Hypothesis A testable statement. Model An explanation of how something occurred Theory A broad generalization that explains situations. Quantity Something with size or an amount. SI Le Systeme International d'unites. Weight The measure of the gravitational pull. Derived units Combinations of SI base unit forms. Volume The amount of space occupied by an object. Density Mass / Volume – the ratio of mass to volume, or mass divided by volume. Conversion factor A ratio derived from the equality between two different units that can convert. Accuracy How close a single measurement is to its true value. Percent error Subtracting the experimental value from the accepted value, dividing the difference by the accepted value x 100. Scientific notation Numbers written in n x 10^s. Directly proportional Two quantities that are divided to each other to get a constant value. Inversely proportional Two quantities that have a product that is a constant.