more temperature =- more kinetic energy- more speed- more vibration- more separation - more potential energykinetic = movement
keep heating a liquid = turns into gas once they escape the other molecules completely
abs
absolute 0 = -273C0K (kelvin)
Liquids and solids are incompressible but gases are easily compressed -- molecules in a gas are spread out
Change of state happens where the temperature seems like it isn't changing -- energy being used for change in statetake longer in L-->G because more separation is neeed
Evaporation occurs when a molecule on the surface has enough energy to escape from the liquid- evaporating molecule has enough energy to break free from the attractive forces between the liquid molecules
when temperature increases the rate of evaporation increases as more molecules move faster and there is more kinteic energy to escape the liquid
they
they escape by overcoming the forces of attraction
When you put alcohol of room temperature is spread on your arm it feels cold = takes heat energy from your arm to evaporate
Gas pressure is caused by molecules htting the sides of their container- equal numbers of molecules moving in all directions = pressure is the same in all directionsWhen the molecules hit the sides of the container, they rebound and cause a force
Spe
Speed increase = pressure increasebecause:- molecules hit the walls more frequently- more force
Les
Less volume = - same speed- more pressure because it hits the walls more frequently (less space)
Same pressure, more speed = more volume
p
pressure increase = volume decrease- inversely proportional
Boyle's Law: P1 V1 = P2 V2Pressure of a gas is inversely proportional to the volume provided that the temperature remains constant
when matter is heated -- molecules move faster with more force
matter expandsvolume increases
gases expand the mostliquids nextthen solids
uses
uses of thermal expansion: thermometersbio-metallic strips in fire alarmslids of jars
Pressure Particles in fluids are constantly moving in a random motion. When they collide with each other, they exert a pressure on the walls of the container.Atmospheric Pressure:The value of atmospheric pressure is 100 kPa (kilo Pascal). The atmospheric pressure is equal to the internal pressure of an object.If the atmospheric pressure is greater than the internal pressure, then the object will collapse as there is less pressure inside to support its shape.Units:Measured in either N/m2 or Pascals (Pa) . 1Pa = 1N/m2
Solids, Liquids and Gases
Kinetic Theory
Evaporation
Pressure
Thermal Expansion
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