First Law vs Conservation of Mass

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Harnadar Anand 2F
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

First Law vs Conservation of Mass

Postby Harnadar Anand 2F » Sat Jan 09, 2016 12:56 pm

How are the First Law of Thermodynamics and the Law of Conservation of Mass different?

Matthew Gutierrez 2D
Posts: 19
Joined: Fri Sep 25, 2015 3:00 am

Re: First Law vs Conservation of Mass

Postby Matthew Gutierrez 2D » Sat Jan 09, 2016 1:47 pm

The Law of Conservation of Mass, in the context of a chemical reaction, states that no atoms are created or destroyed in a reaction. So the number of atoms of reactants is equal to the number of atoms of products. This is why we balance chemical equations. Generally, it relates to matter and how it cannot be created or destroyed.

The First Law of Thermodynamics states that the internal energy of an isolated system is constant. Energy cannot be created or destroyed, only transferred. Therefore, to change the energy of the system, we would have to do work to it or transfer heat into it.


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