<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><span></span></div><br><div><div>Hank,</div><div>air weighs .0807 lbs per cubic foot approximately, depending on temperature.</div><div>So if you have an 80 cubic foot scuba tank the air weight full is 6.45 lb.</div><div>A scuba tank is 80 cubic ft at 3000 psi. If you halve the pressure you halve</div><div>the amount of air & weight. In other words, if you double the pressure you</div><div>double the weight for a given volume.</div><div>Let us know what you are trying to calculate if this doesn't help.</div><div>Alan</div><div><br></div><div><br></div><div><br><div>Sent from my iPad</div></div><div><br>On 4/03/2017, at 6:33 AM, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_ym19_1_1488561134912_6309">Okay, I am stumped! can someone give me a formula to calculate the weight of air at a particular psi per cubic foot.</div><div id="yui_3_16_0_ym19_1_1488561134912_6309">Thank you</div><div id="yui_3_16_0_ym19_1_1488561134912_6309">Hank</div></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></div></body></html>