http://www.ck12.org Chapter 26. Glossary
Exactness of a measurement.
pressure
Amount of force pushing against a given area.
primary color
One of three colors of light (red, green, or blue) that can be combined to produce all other colors of light.
product
Substance that is produced in a chemical reaction.
projectile motion
Motion of an object that has initial horizontal velocity but is also pulled down toward Earth by gravity.
protein
Biochemical compound that contains oxygen, nitrogen, and sulfur in addition to carbon and hydrogen and is
made up of one or more chains of smaller molecules called amino acids.
proton
Positively charged atomic particle inside the nucleus of an atom.
pulley
Simple machine that consist of a rope and grooved wheel.