CHARACTERISTICS OF
PARTICLES
• Particles exhibit some characteristics.
They can influence the state and
properties (physical and chemical) of a
substance.
• The three characteristics shown by
particles of matter are as follows.
CHARACTERISTICS OF
PARTICLES
• Particles are tiny.
• Particles have spaces between them
• Particles attract each other
• Particles constantly in motion (or) Particles
are continuously moving
Arrangement of particles
• Arrangement of particles
Plasma
Physical properties
STATES OF MATTER
•The FIVE States of Matter• FIVE States
• Solid
• Liquid
• Gas
• Plasma
• Bose Einstein condensate
STATES OF MATTER
➢Based upon particle arrangement
➢Based upon energy of particles
➢Based upon distance between particles
Kinetic Theory of Matter
Matter is made up of particles
which are in continual random
motion.
Kinetic Theory- the tiny particles
in all forms of matter are in
constant motion
STATES OF MATTER
SOLIDS
•Particles of solids are
tightly packed, vibrating
about a fixed position.
•Solids have a definite
shape and a definite
volume. Heat
STATES OF MATTER
LIQUID
▪ Particles of liquids are
tightly packed, but are
far enough apart to
slide over one
another.
▪ Liquids have an
indefinite shape and a
definite volume. Heat
STATES OF MATTER
GAS
▪ Particles of gases
are very far apart
and move freely.
▪ Gases have an
indefinite shape
and an indefinite
volume. Heat
But what happens if you raise the
temperature to super-high levels…
between
1000°C and 1,000,000,000°C ?
Will everything
just be a gas?
STATES OF MATTER
PLASMA
▪ A plasma is an ionized gas.
▪ A plasma is a very good conductor of electricity and is affected by magnetic fields.
▪ Plasmas, like gases have an indefinite shape and an indefinite volume.
• Plasma is the
common state
of matter
STATES OF MATTER
SOLID LIQUID GAS PLASMA
Tightly packed, in
a regular pattern
Vibrate, but do not
move from place
to place
Close together
with no regular
arrangement.
Vibrate, move
about, and slide
past each other
Well separated
with no regular
arrangement.
Vibrate and move
freely at high
speeds
Has no definite
volume or shape
and is composed
of electrical
charged particles
Some places where plasmas are found…
1. Flames
2. Lightning
3. Aurora (Northern Lights)
The Sun is an example of a star in its
plasma state
COLD PLASMA
COLD PLASMA PEN
BEC
BOSE EINSTEIN CONDENSATE
Bose Einstein condensate
• Fifth form of matter Bose Einstein condensate(BEC).
• In 1920, Indian physicist satyender Nath Bose has done some
calculations for a fifth state of matter.
• Building on his calculations , Einstein predicted a new state of
matter that is Bose Einstein Condensate (BEC).
• In 2001,Eric A. Cornell,Wolfgang Ketterle and Carl E. Wieman of
USA received Nobel prize in physics for achieving “Bose Einstein
Condensation”.
• The Bose Einstein Condensate (BEC) is formed when a low density
gas about 100,000 the density of normal air, under high pressure is
exposed to super low temperatures.
Unit of temperature • The Common Unit of Temperature and SI Unit of Temperature:
• The common unit of measuring temperatures (like melting points, boiling points etc.) is ‘degrees Celsius’ which is written in short form as °C.
• Laboratory thermometers and clinical thermometer are calibrated on Celsius scale of temperature.
• There is another scale of temperature called Kelvin scale of temperature which is used by the scientists mainly for research work. The SI unit of measuring temperature is Kelvin, which is denoted by the symbol K.
• The relation between Kelvin scale and Celsius scale of temperature can be written as:
• Temp. on Kelvin scale=Temp. on Celsius scale + 273
• To convert a temperature on Celsius scale to Kelvin scale, we have to add 273 to the Celsius temperature.
• And to convert a temperature on Kelvin scale to the Celsius scale, we have to subtract 273 from the Kelvin temperature.
Change of State of Matter:
• We can change the physical state of matter in
two ways:
• By changing the temperature (heating or
cooling).
• By changing the pressure (increasing or
decreasing the pressure).
• These two factors decide whether a given
substance would be in a solid, liquid or gaseous
state.
Effect of Change of Temperature:
Solid to Liquid Change: Melting
• The process in which a solid substance changes into a liquid on heating, is called on melting or fusion.
• The temperature at which a solid substance melts and changes into a liquid at atmospheric pressure, is called melting point of substance. For example, the ice melts at a temperature of 0°C to form liquid water, so the melting point of ice is 0°C (zero degree Celsius). At melting point, ice changes its state from solid to liquid.
• Different solids have different melting points. Higher the melting point of a solid substance, greater will be the force of attraction between its particles.
• The melting point of a solid is an indication of the strength of the force of attraction between its particles.
• When a solid substance is heated, the heat energy makes its particles vibrate more vigorously. At the melting point, the particles of a solid have sufficient kinetic energy to overcome the strong forces of attraction holding them in fixed positions and break to form small groups of particles and the solid melts to form a liquid.
Liquid to Gas Change: Boiling (or Vaporization):
• The process in which a liquid substance changes into a gas rapidly on heating, is called boiling.
• The temperature, at which a liquid boils and changes rapidly into a gas at atmospheric pressure, is called boiling point of the liquid.
• For example, when water is heated to a temperature of 100 °C (hundred degree Celsius).
• Different liquids have different boiling points.
• The boiling point of a liquid is a measure of the force of attraction between its particles.
• When a liquid is heated, the heat energy makes its particles move even faster. At the boiling point the particles of liquid have sufficient kinetic energy to overcome the forces of attraction holding them together and separate into individual particles. And the liquid boils to form a gas.
Gas to Liquid Change:
Condensation
• The process of changing a gas (or vapour) to a liquid by cooling is called condensation.
• When steam (or water vapour) changes into water on cooling, it is called condensation of steam.
• When a gas is cooled enough, then its particles lose so much kinetic energy that they slow down, move closer together until they start being attracted to each other, and form a liquid.
Liquid to solid change: Freezing
• The process of changing a liquid into a
solid by cooling is called freezing.
• For example, when water is cooled, it gets
converted into a solid called ‘ice’. This is
called freezing of water. Freezing means
solidification.
Change of State of Matter:
Latent Heat
• Latent heat:
• The heat energy which has to be supplied to change the state of a substance is called its latent heat.
• Latent heat does not raise (or increase) the temperature. But latent heat has always to be supplied to change the state of a substance .The word ‘latent’ means ‘hidden’.
• The latent heat which we supply is used up in overcoming the forces of attraction between the particles of substance during the change of state. Latent heat does not increase the kinetic energy of the particles of the substance, so the temperature of a substance does not rise during the change of state.
• Latent heat is of two types:
• Latent heat of fusion
• Latent heat of vaporization.
Latent Heat of Fusion (solid to
liquid change):
• The heat which is going into ice but not increasing its temperature, is the energy required to change the state of ice from solid to liquid (water). This is known as the latent heat of fusion of ice (or latent heat of melting of ice).
• The latent heat of fusion (or melting) of a solid is the quantity of heat in joules required to convert 1 kilogram of the solid (at its melting point) to liquid, without any change in temperature.
• The latent heat of fusion of ice is 3.34×105 joules per kilogram (or 3.34 ×105 j/kg).
Latent Heat of Vaporization
(liquid to gas change):
• The latent heat of vaporization of a liquid is the
quantity of heat in joules required to convert 1
kilogram of the liquid (at its boiling point) to vapour or
gas, without any change in temperature.
The latent heat of vaporization of water is
22.5×105 joules per kilogram (or 22.5×105 j/kg).
Note: It has been found that the burns caused by
steam are much more severe than those caused by
boiling water though both of them are at the same
temperature of 100 °C. This is due to the fact that
steam contains more heat, in the form of latent heat,
than boiling water.
Sublimation• The transition of a substance on heating/with out heating
directly from its solid phase to gaseous phase, without
changing into the liquid phase (or vice versa) is
called sublimation.
Effect of change in pressure on
state of matter
.• Gas to liquid: Gases can be liquefied by applying
pressure and reducing the temperature. When a high
pressure is applied to a gas, it gets compressed and if
the temperature is lowered, the gas is liquefied.
• Solid CO2 gets converted directly to gaseous state on
decrease of pressure to 1 atmosphere without coming
into liquid state. This is the reason that solid carbon
dioxide is also known as dry ice.
Change of state by applying pressure
Evaporation• The phenomenon by which molecules in liquid state undergo a spontaneous
transition to the gaseous phase at any temperature below its boiling point is called evaporation.
• For example, the gradual drying of damp clothes is caused by the evaporation of water to water vapour.
• Factors affecting evaporation
• Temperature: The rate of evaporation increases with an increase in temperature.
• Surface area: The rate of evaporation increases with an increase in surface area.
• Humidity: The rate of evaporation decreases with an increase in humidity.
• Wind speed: The rate of evaporation increases with an increase in wind speed.
• Cooling due to evaporation
• During evaporation, the particles of a liquid absorb energy from the surroundings to overcome the interparticle forces of attraction and undergo the phase change. The absorption of heat from the surrounding makes the surrounding cool.For example, sweating cools down our body.
• Physical Nature of Matter