2. WHAT IS
THERMODYNAMICS
Thermodynamics is a branch of science that
deals with the study of heat and temperature
and their relation to other forms of energy. It
applies to a variety of science and
engineering topics. Such as chemical,
physical and mechanical engineering.
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3. Sweating in a crowded
room:
In a crowded room, everybody starts sweating. The
body starts cooling down by transferring the body heat
to the sweat. Sweat evaporates adding heat to the
room.
4. Melting of ice cube:
Ice cubes in a drink absorb heat from the drink making
the drink cooler. If we forget to drink it, after some time
, it again attains room temperature by absorbing the
atmospheric heat.
5. Air conditioner and heat pump:
The air conditioner removes heat from the room
and maintains it at a lower temperature by
throwing the absorbed heat into the
atmosphere. The heat pump absorbs heat from
the atmosphere and supplies it to the room
which is cooler in winter.
6. Thermodynamics has very wide
applications as basis of thermal
engineering .almost all process and
engineering industries, agriculture,
transport,commercial and domestic
activities use thermal engineering. But
energy technology and the power
sector are fully dependent on the laws
of thermodynamics.
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7. Thermodynamics is considered
to be one of the most important
parts of our day to day life.
whether you are travelling in
any vehicle sitting comfortably
in air conditioned room,
watching television etc
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8. The study of thermodynamics
. It involves a system and surroundings
where all the experiment is done for
the discovery of the device. There are
various types of thermodynamics
processes that help implement
thermodynamics law.
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9. 9
PRINCIPLES
The four principles of
thermodynamics
control the behavior
of these quantities
which provide a
quantitative
description using
quantifiable
macroscopic physical
characteristics but
may be described by
statistics.
10. TAKING A BATH:
When the person submerges his body into the
bathtub the person will feel comfortably warm as
the temperature of the water is higher than the
person’s body. After some time, the water will
cool as the heat is lost to the atmosphere.
11. LAWS OF THERMODYNAMICS
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If two systems are each in
thermal equilibrium with a third
system, then they are in
thermal equilibrium with each
other.
when energy passes into or out
of a system (as work, heat, or
matter), the system's internal
energy changes in accord with
the law of conservation of
energy.
In a natural thermodynamic
process, the sum of the
entropies of the interacting
thermodynamic systems never
decreases. Another form of the
statement is that heat does not
spontaneously pass from a
colder body to a warmer body.
A system's entropy approaches
a constant value as the
temperature approaches
absolute zero.
14. Second law of thermodynamics
1. The compressor constricts the refrigerant vapor,
raising its pressure, and pushes it into the coils on
the outside of the refrigerator.
2. When the hot gas in the coils meets the cooler air
temperature of the kitchen, it becomes a liquid.
3. Now in liquid form at high pressure, the
refrigerant cools down as it flows into the coils
inside the freezer and the fridge.
4. The refrigerant absorbs the heat inside the fridge,
cooling down the air.
5. Last, the refrigerant evaporates to a gas, then
flows back to the compressor, where the cycle starts
all over. 14
15. Third law of thermodynamics
Vapors of water are the gaseous forms
of water at high temperatures. The
molecules within the steam move
randomly. Therefore, it has high
Entropy.
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Low entropy
High entropy
