# Shared Flashcard Set

## Details

Chapter 13
Pressure
19
Physics
03/10/2008

Term
 fluids
Definition
 materials that flow and have no definate shape of their own
Term
 pressure
Definition
 the force on a surface, divided by the area of the surface.
Term
 fluids
Definition
 materials that flow and have no definate shape of their own
Term
 pascal
Definition
 the unit of pressure in the SI system which is 1 N/m^2
Term
 combined gas law
Definition
 the combination of Boyle's law and Charles's law relating pressure, temperature, and volume of a fixed amount of ideal gas
Term
 ideal gas law
Definition
 pressure times the volume is equal to the number of moles multiplied by the constant R and the Kelvin temperature PV=nRT
Term
 thermal expansion
Definition
 when heated all forms of matter generally become less dense and expand to fill more space
Term
 cohesive forces
Definition
 the electromagnetic forces of attraction that like particles exert on one another; responsable for surface tension and viscosity
Term
Definition
 electromagnetic attractive forces that act between particles of different substances exerted on one another; responsible for capillary action
Term
 pascals principal
Definition
 any change in pressure applied at any point on a confined fluid is transmitted undiminished throughout the fluid
Term
 buoyant force
Definition
 increase in pressure with increasing depth creates this upward force.
Term
 archimedes' principle
Definition
 an objectimmersed in a fluid has an upward force on it that is equal to the weight of the fluid displaced by the object
Term
 bernoulli's principle
Definition
 as the velocity of a fluid increases, the pressure exerted by that fluid decreases
Term
 streamlinesthe
Definition
 flow of fluids around objects
Term
 crystal lattice
Definition
 a fixed, regular pattern formed when the temperature of a liquid is lowered, the average kinetic energy of its particles decreases and, for many solids, the particles become frozen but do not stop moving, but instead vibrate in fixed location
Term
 coefficient of volume expansion
Definition
 equal to the change in volume divided by the original volume and the change in temperature
Term
 coefficient of linear expansion
Definition
 equal to the change in length, divided by the original length and the change in temperature
Term
 plasma
Definition
 a gaslike, fluid state of matter  made up of negatively charged electrons and positively charged ions that can conduct electricity; makes up most of the matter in the universe, such as stars
Term
 amorphous solid
Definition
 a substance having a definate shape and volume, but lacking a regular crystal structure
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