Chapter 3 Vocabulary Measurement Scientific notation

Measurement a quantitative description that includes both a number and a unit Examples: Length (4 meters), age (15 years), or daily temperature (31°C)

Scientific Notation an expression of numbers in the form m x 10 n, where m is equal to or greater than 1 and less than 10, and n is an integer

Chapter 3 Vocabulary Accuracy Precision Accepted Value Experimental Value

Accuracy the closeness of a measurement to the true value of what is being measured

Precision describes the closeness, or reproducibility, of a set of measurements taken under the same conditions

Accepted Value a quantity used by general agreement of the scientific community, a known value Example: 0°C freezing point of water or 100°C boiling point of water

Experimental Value a quantitative value measured during an experiment

Chapter 3 Vocabulary Error Percent Error Significant Figures

Error the difference between the accepted value and the experimental value Error = experimental value – accepted value

Percent Error the percent that a measured value differs from the accepted value accepted value x 100%Percent error = |error | ____________

Significant Figures all the digits that can be known precisely in a measurement, plus a last estimated digit

Chapter 3 Vocabulary Mass Weight Volume

Mass a measure of the amount of matter that an object contains SI base unit of mass is the kilogram

Weight a force that measures the pull of gravity on a given mass

Volume a measure of the space occupied by a sample of matter