Question 1045244
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Pressure of a gas varies inversely with the volume. 40 liters of a gas has a pressure of 120 psi
( {{{highlight(cross(ponds))}}} pounds per square in - like car tire pressure). The volume is changed to 15 liters, what is the new pressure?
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<pre>
Solve the "inverse" proportion

{{{120/x}}} = {{{15/40}}}.

x = {{{(120*40)/15}}} = 320 psi.
</pre>

On proportions, read the lessons 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/proportions/lessons/-Proprtions.lesson>Proportions</A>

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF = http://www.algebra.com/algebra/homework/proportions/lessons/Using-proportions-to-solve-word-problems.lesson>Using proportions to solve word problems</A> 

in this site.