Hi all, I do hope I have chosen the right forum thread to ask this question. I don't want to waste anyones time. I am trying to help guide my girlfriend with some physics questions with not much luck. One question that we are struggling with is: A typical backyard swimming pool holds 150yd3 of water. What is the mass in pounds of water? So I believe you would do 150 cubed which is 150 x 150 x 150 = 3375000 yards of water in the pool - am i correct? However from there I am lost in regards to working out what the mass in pounds of water is? Many thanks to anyone in advance which can guide us through breaking down and answering such a question.