17 terms

# Physical Science - Introduction - Unit 1

#### Terms in this set (...)

Scientific Method
organized set of investigation procedures that can include stating a problem, forming a hypothesis, researching and gathering information, testing a hypothesis, analyzing data, and drawing conclusions.
Hypothesis
educated guess using what you know and what you observe.
Experiment
organized procedure for testing a hypothesis that tests the effect of one thing on another under controlled conditions.
Variable
factor that can cause a change in the results of an experiment.
Constant
in an experiment, a variable that does not change when other variables change.
Control
standard used for comparison of test results in an experiment.
Density
mass per unit volume of a material.
Dependent Variable
factor that changes as the independent variable changes.
Independent Variable
factor that, as it changes, affects the measure of another variable.
SI
International System of Units -the improved, universally accepted version of the metric system that is based on multiples of ten and includes the meter (m), liter (L), and kilogram (kg).
Volume
amount of space occupied by an object.
Mass
amount of matter in an object.
Graph
visual display of information or data that can provide a quick way to communicate a lot of information clearly in a small amount of space.
Theory
explanation of things or events that is based on knowledge gained from many observations and experiments (book). An explanation for an observation or series of observations that is substantiated by a considerable body of evidence.
Scientific law
statement about how things work in nature that seems to be true all the time (book). A set of observed regularities expressed in a concise verbal or mathematical statement.
Standard
exact, agreed-upon quantity used for comparison
Derived unit
a unit obtained by combining different base units; example is density - D = m/V