Okay in an example problem for Charles Law, my teacher had the information;
T1 = 317 K
V1 = 250 cm^3
T2 = 273 K
V2 = ??
When she put all the information in the equation she go the answer
V2 = 215.2996845 cm^3
But then she changed it to 220 cm^3
Could someone just explain to me how and why she did this?

Question

Okay in an example problem for Charles Law, my teacher had the information;
T1 = 317 K
V1 = 250 cm^3
T2 = 273 K 
V2 = ??
When she put all the information in the equation she go the answer 
V2 = 215.2996845 cm^3
But then she changed it to 220 cm^3
Could someone just explain to me how and why she did this?

anonymous · Answer

that don't make any sense she should have simplified to 215 cm^3 not 220. There is no good reason to round the answer that high

anonymous · Answer

maybe it was because the first volume only had two significant numbers so your teacher changed the second volume to have two as well

grimsnightmare · Answer

Well thank you.  I didn't think it made any sense either.