Chapter 13 Flashcards
(14 cards)
Kinetic energy
The energy an object has because of its motion
Kinetic theory
A theory explaining the state of matter based on the concept that all matter consists of tiny particles that are constantly in motion
Vacuum
A space where no particles of matter exist
Atmospheric pressure
The pressure exerted by atoms and molecules in the atmosphere surrounding earth, resulting from collisons of these particles with objects
Barometer
An instrument used to measure atmospheric pressure
Pascal (Pa)
The SI unit of pressure
Standard atmosphere (atm)
A unit of pressure, it is the pressure required to support 760mm of mercury in a mercury barometer at 25°C
Vaporization
The conversion of a liquid to gas or a vapor
Evaporation
Vaporization that occurs at the surface of a liquid that is not boiling
Vapor pressure
A measure of the force exerted by a gas above a liquid in a sealed container; a dynamic equilibrium exists between the vapor and the liquid
Boiling point (BP)
The temperature at which the vapor pressure of a liquid is just equal to the external pressure on the liquid
Normal boiling point
The boiling point for a liquid when the pressure is 101.3kPa or 1atm
Melting point
The temperature at which a substance changes from a solid to a liquid: for water this is 0°C
Freezing point
The temperature at which a liquid changes to a solid
