Number of Trials 19° C (room temp) 2-5° C (cold) 66-69° C (hot) Weight of 1 staple Length of needle (d) 1 11 14 11 1/15= .0666 g .037 m 2 13 14 11 3 12 13 11 4 13 13 10 5 12 12 11 6 12 13 10 7 13 12 11 8 13 13 11 9 12 13 10 10 12 12 11 Average 12.3 12.9 10.7 Force (mg) .0080441992 N .0084365992 N 0.00699773 Surface Tension S=F/2d .1087053946 N/m .114008097 N/m .0945639189 N/m Temperature of Water Surface Tension 19° C (room temp) 0.108705395 2-5° C (cold) 0.114008097 66-69° C (hot) 0.094563919