Quote:
Originally Posted by Racer26
Changing air temp from 20C to 21C would add 0.028" to the diameter of a ball. (If T1 = 15C and T2 = 22C, the ball changes 0.200" in diameter)
Did I do that right? It doesn't seem right to me. I think changing temperature will also change P.
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You did it correctly assuming that pressure remains constant. If pressure remains the same then your volume will increase as temperature increase and vice versa. Unfortunately this doesn't translate perfectly to the real world since the balls would most likely increase in both pressure and volume. If you had the measurement of one of those two factors (before and after of volume or pressure) you could find the other one fairly easily.
Our team has also noticed a large variability due to temperature of the ball. When prototyping our shooter and performing initial testing with it mounted on our robot we tested outside. We noticed a significant difference after moving our testing into an abandoned Sears building (free rent since it's soon to be demolished) and the temperature was a good 40* warmer.