Starting with the expression for work 
, one can change the look of the expression without changing what it represents by dividing the force F by the area it is applied over and multiplying the differential distance dx by that same area. Force divided by area is a pressure (P) , and area times the differential distance is a differential volume. Hence one can also describe work as 
. A gas at constant temperature will change its pressure inversely to changes in volume, 
. If a sample of gas has a pressure of 1 atmosphere when its volume is 1 L, how much work does it do when it expands from 1 L to 4 L?
Definitions:
Compound Interest
Interest on a loan or deposit calculated based on both the initial principal and the accumulated interest from previous periods.
Present Value
The assessed present-day value of money to be received in the future or a pattern of cash inflows, factoring in an established rate of return.
Effective Rate
is the actual interest rate that an investment earns or a loan incurs, including the effects of compounding over a given period.
Present Value
The current worth of a future sum of money or stream of cash flows given a specific rate of return, accounting for the time value of money.
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