At one time or another, we have all been in the situation of being one of these two – the borrower or the lender.
“Hey pal, mind if I borrow your car?” Or the famous, “Could you lend me some money?”
Most prefer not to be on either side of this scenario, but especially the lender! These phrases, amongst friends, can bring that unsettling feeling we all know too well. Now, by all means, I enjoy helping a friend or even a stranger, but lending out something without certainty of it being returned (or returned in one piece) is always in the back of one’s mind. As for being the other, no one likes the feeling of being in need or having to ask to borrow something. read more →
A Guide to Good-Sense Diving
We divers are a fortunate lot. We can enjoy first hand a part of the environment that most non-divers experience only vicariously — through television, movie or computer screens. We each have our own special motivations for diving, but one thing is common: we love our recreation.
Each year new and experienced divers alike from all over the world make millions of enjoyable scuba dives; and for the vast majority of the time, we make these dives without incident or injury. This is because as certified divers, we take our fun seriously: we have taken the time to learn safety guidelines to become conscientious and responsible divers, so we can keep on diving. And we talk about our dives, learning from our own — and others’ — experiences. read more →
Question: (Dive Medicine) Can you explain the transfer of gases into and out of a scuba diver’s body?
Henry’s law can be used to examine the transfer of gases into and out of a scuba diver’s body.
Henry’s Law and the Diver
When a diver submerges breathing compressed air, the increased pressure causes more nitrogen to dissolve into the diver’s blood and tissues. Throughout the dive, as depth changes, nitrogen continues to dissolve into and out of the diver’s body. To avoid an excess of nitrogen in the body that could result in decompression sickness, the diver must follow established depth and time limits. Similarly, when breathing alternative gases under pressure, a diver must follow the proper depth and time profiles to avoid conditions that could cause adverse symptoms caused by the particular gases being used. It is important for divers to select a breathing gas mixture appropriate to the depth and demands of the dive.