# Shared Flashcard Set

## Details

IGCSE Physics Solids, Liquids and Gases
IGCSE Physics Solids, Liquids and Gases
22
Physics
10/16/2011

Term
 Density
Definition
 The mass per unit volume of a substance. Unit = kg/m3 or g/cm3
Term
 Pressure
Definition
 The force exerted per unit area of a surface. Unit = pascal (1 Pa = 1N/m2), bar, atm
Term
 Density formula
Definition
 ρ = Mass/Volume
Term
 Pressure formula
Definition
 pressure = Force/Area p=F/A
Term
 Change of state
Definition
 When a substance changes between solid, liquid or gas. Energy is required for the change to happen.
Term
 Kinetic Theory of Matter
Definition
 A theory that matter is made of trillions of tiny particles which are in constant random motion and follow simple physical laws.
Term
 Pressure due to particles
Definition
 The collisions on the sides of the container by trillions of particles exert a force and therefore pressure.
Term
 Temperature due to particles
Definition
 The kelvin temperature is proportional to the average random kinetic energy of the particles.
Term
 Brownian motion
Definition
 The motion in a fluid of microscopic particles such as pollen or dust due to collisions with much smaller, fast-moving, invisible molecules in the fluid. The particles which are seen to dance about are the dust particles, not the molecules.
Term
 Absolute zero temperature
Definition
 The lowest temperature which can be achieved when the particles in a substance have zero kinetic energy and cease all motion. This occurs at -273 degrees C.
Term
 Thermodynamic temperature
Definition
 Temperature is proportional to average, random kinetic energy of the molecules.
Term
 Kelvin scale of temperature
Definition
 An absolute temperature scale starting at absolute zero whose unit is the same size as a degree Celsius.
Term
 Pressure law
Definition
 At constant volume, the pressure of a fixed mass of gas is proportional to its absolute temperature.
Term
 Boyle's law
Definition
 At constant temperature, the pressure of a fixed mass of gas is inversely proportional to its volume.
Term
 Pressure in a fluid
Definition
 Pressure in a stationary fluid is exerted equally in all directions.
Term
 Pressure in a fluid formula
Definition
 pressure difference = height * density * gravitational field strength p = h ρ g
Term
 Particles in a solid
Definition
 They are close-packed in an orderly fashion and vibrate about fixed positions.
Term
 Particles in a liquid
Definition
 They are close-packed in a disordered fashion and move around freely.
Term
 Particles in a gas
Definition
 They are far apart and move around quickly and freely.
Term
 Celsius to kelvin conversion formula
Definition
 T(°C) = T(K) - 273 K
Term
 Pressure law formula
Definition
 p1/T1 = p2/T2
Term
 Boyle's law formula
Definition
 p1V1 = p2V2
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