1. D A V E G A U R A V S
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M . T E C H S E M 1
P D P U
First Law of Thermodynamics
Closed and Open System

2. First Law
 Energy can neither be created nor be destroyed. It
can transformed from one form to another
 Work and heat are different form of same entity
called energy.
 Energy which enters the system in form of heat may
leave as work or energy which enters in form of work
may leave as heat.

3. where j is joules constant
which is a cyclic process.

4. First law for closed system undergoing change of
state
 𝑄 − 𝑊 = δ𝐸
 Where E is change in the internal energy of the
system.