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23 Cards in this Set

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abosolute zero
the zero point on the kelvin temperature scale, equivalent to -273.15 degrees C; all molecular motion theoretically stops at this temp.
accepted value
a quantity used by general agreement of the scientific community
accuracy
the closeness of a measurement to the true value of what is being measured
Celsius scale
the temp. scale--> freezing is 0 degress and boiling is 100 degrees
density
the ratio of the mass of an object to its volume
error
the difference between accepted value and experimental value
experimental value
a quanitive value measured during an experiment
gram
a metric mass unit equal to the mass of 1 cubic cm of water at 4 degrees C
hydrometer
a device used to measure the specific gravity of liquid
Kelvin scale
temp. scale --> freezing point is 273 K and boiling is 373 K; 0 K is absolute zero
kilogram
the mass of 1 L of water at 4 degrees; base unit of mass
liter
volume of cube measuring 10 cm on each edge; common unit of volume
meter
base unit of length in SI
percent error
the percent that a measured value differs from the accepted value
precision
describes the closenss, or reproducibility, of a set of measurements taken under the same conditions
qualitative measurement
a measurement that gives descrptive, nonumeric results
quantitive measurement
a measurement that gives definite, usually numeric results
scientific notations
express numbers n x 10^n where n is equal or greater than 1 and less than 10 and n is an integer
significant figures
all the digits that can be known precisely in a measurement, plus a last estimated digit
specific gravity
the ratio of the density of a substance to that of a standard substance
temperature
a measure of the average kinetic energy of paticles in matter; temp. determines the direction of heat transfer
volume
the space occupied by a sample of matter
weight
force that measures the pull of gravity of a given mass