Assuming he was talking of liquid water, Density of air, 0 C: 1.2920 kg·m^−3 Density of water 4 C: 1000 kg·m^−3
density of granite 2.75 g/cm^3 density of basalt 3.0 g/cm^3 Norm is correct. By the way Norm, the technology for extended diving time uses the divers breath circulated through a CO2 scrubber and the cleansed air, now about 16% oxygen, still enough to breathe, is recirculated to the diver with a little bit of make up air from the high-pressure cylinder to keep the pressure right. There is enough oxygen remaining in an exhaled breath to support life, hence mouth-to-mouth resucitation works. CO2 is the main drive for inhaling and exhaling air. When one hyperventilates, the normal CO2 in the blood is blown off, and one can hold one's breath long enough to pass out before the urge to breathe reasserts itself. Craig Scott RN AE6E ACLS ASLS BDLS PALS TNCC Columbia, South Carolina -----Original Message----- From: liveaboard-boun...@liveaboardonline.com [mailto:liveaboard-boun...@liveaboardonline.com] On Behalf Of ROBERT ZANUSSI Sent: Monday, April 25, 2011 23:09 To: liveaboard@liveaboardonline.com Subject: Re: [Liveaboard] Question Norm, its great that you have your own opinions but before you say this gentleman, who has a degree of some sort in geology, perhaps even a Phd, is wrong, I would like you to provide some proof. In other words, find a documented source which backs up your opinion. Rob > > I have seen many times in storytelling a situation where people are > trapped in an airtight environment and it is said that they will run > out of oxygen. > > In ordinary storytelling it might not be such a problem, after all, it > is fiction. > > > But recently I have seen the same thing said on the Science Channel, > in both fiction and non-fiction and I think that the assertion is > wrong. > > > People that see these falsehoods in a semi-truthful or instructional > situation on the tube, especially children who are trying to form a > truthful picture of the world around them, causes confusion that > required extra effort to change to reality. > > A classic example was on the Science Channel some months ago on a show > called How the Earth was Made. A man who was said to be a geologist > held a piece of basalt in one hand and a piece of granite in the > other. He explained that the granite was less dense than the basalt > so that was why the granite was prevalent on the surface of the earth. > Which was fine. But he interjected that the difference in density > between the granite and the basalt was greater than difference > between the density of water and air. This is so > obviously wrong it would simply be laughable except for the fact that > someone portrayed as a teacher was putting false information into a > child's mind which will have to be changed eventually. I just believe > lying to children is wrong. _______________________________________________ Liveaboard mailing list Liveaboard@liveaboardonline.com To adjust your membership settings over the web http://liveaboardonline.com/mailman/listinfo/liveaboard To subscribe send an email to liveaboard-j...@liveaboardonline.com To unsubscribe send an email to liveaboard-le...@liveaboardonline.com The archives are at http://www.liveaboardonline.com/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/liveaboard@liveaboardnow.org The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
