Thanks to all the people who responded to my query about the weight of air. Sorry, but there were too many replies for me to thank everyone individually. I am sure most of you would have guessed that I was trying to calculate the amount of weight change in a tank from full to empty. I have recently purchased two new tanks which have very different bouyancy characteristics to the twins I have been using. I did a weight check dive in shallow water (with tanks full) and added on a bit extra for the air used when I tried them on a deeper dive but it would seem that I underestimated how much bouyancy change would occur. Thanks again, Dave. -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Ocean Internet - "The Quality ISP" http://www.ocean.com.au/info.html -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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