The document discusses thermodynamics in ecology. It explains that the sun provides the energy that drives photosynthesis, the most important chemical reaction. It introduces concepts like food chains, food webs, and how energy enters ecosystems. It defines thermodynamics as the study of how energy causes movement and changes with temperature, pressure and volume. It outlines the first law of thermodynamics that energy cannot be created or destroyed, just changed forms, and the second law that entropy increases and energy is lost as heat in all conversions. Finally, it states that life requires a continuous expenditure of energy.

1. By Prof. Liwayway Memije-Cruz
Thermodynamics in Ecology

3. Energy and how it is
handled and used by
living organisms.

4. The Sun
The sun is the
driving force of
photosynthesis
which is the most
important
chemical reaction
of all the
chemical
reactions.

5. Food Energy Chain

6. Food Web

7. Energy input in an Ecosystem

8. Thermodynamics
 the branch of physics involved
with studies on the effects of
changes in temperature,
pressure, and volume on
physical systems at the
macroscopic scale.
 The motions produced by the
particles produce heat. Heat in
thermodynamics means "energy
in transit" and dynamics relates
to "movement" Based on the said
principle, thermodynamics
studies the movement of energy
and how energy instills
movement.

9. First Law of Thermodynamics: “Energy
cannot be created or destroyed, only
converted from one form to another”
.

10. Entrophy
the degree of disorder or uncertainty in a system

11. Second Law of Thermodynamics
it adds on a
statement about
entropy and how
all energy
conversions are
less than perfect.
The result is loss
of energy –
typically in the
form of heat.

12. Life itself is but a temporary
condition purchased at the cost of a
continuous expenditure of energy.