EDIT: reply to dumb lung volume post here please:
http://forums.deeperblue.net/genera...ttle-low-tech-fun-weekend-sir.html#post668041
hehe, a fun experiment for you (all) this weekend:
- take a snorkel and firmly tape a supermarket bag to the end. it should be a large softish bag, tape up so that there are no air leaks, duct tape works well
- see if you can swivel the snorkel/mouth piece 180 degrees, so the bag is facing down
- take a large bucket and fill it with water, a 20Lt one is great. make sure it's full to overflowing
- empty the bag, suck on the snorkel until it's completely collapsed, hold neck of bag shut with hand
- do a regular breathe up, and fill the bag with your entire lung volume (if you can!)
- clasp the neck of the bag, and thrust it into the bucket, displacing water, try not to put your hand in the bucket, only the bag
- with a calibrated jug, measure how much water it takes to refill the bucket 'till just overflowing a couple of drops
I did this twice, my kids were very amused, and the two readings were: 6.4 and 6.6lts. So I guess I have a non-packet lung volume of 6.5Lts. I'm 1.79 and skinny at 68Kgs, so I think its quite good.
We do everything low-tech here in Chile

but it's fun
Post results...