What Formula Should I Use for Coefficient of Volume Expansion?

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Homework Statement
3. The water volume of the central heating system at 10 º C is 0,800 m3 . (a) What is the volume of water flowing out from the overflow pipe when the system temperature rises to 60 ° C. The coefficient of volume expansion of the water is 2,1 × 10-4 1 / K? b) How does the answer change when you also consider the thermal expansion of the system made of steel? The coefficient of volume expansion of steel is 35,1 × 10-6 1 / K.
Relevant Equations
pv=NRT
I don't know what formula to use to figure that out,help
 
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"The coefficient of volume expansion" makes a much more useful equation than pV= NRT
 
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