The weather is still miserable. The rain, the wind, the whole disgusting nine yards… But, it's not like I could have taken advantage of any beautiful weather anyway, because I have A LOT of homework! All day long I have been glued to The Encyclopedia of Recreational Diving (one of the Dive Master course manuals).
Today I'm studying the physics of diving. I learn that:
- Water is able to conduct heat about 20 times faster than air.
- Underwater objects appear closer by a ratio of about 4:3 and tend to be magnified by 33%.
- Sound travels approximately 4 times faster in water than it does in air, because the denser and more elastic the medium, the better sound is transmitted.
- You have difficulty determining the direction of sound underwater because there's an insufficient delay between the sound striking one ear before the other.
- Following Boyle's law formula P1 x V1 = P2 x V2, we can calculate that if a balloon containing 10 cubic feet of air at 25 feet of seawater is taken to a depth of 85 feet, its exact volume upon reaching 85 feet will be 4.91 cubic feet.
- The pressure changes approximately 5 psig (pounds per square inch) with every 1 degree Farenheit.
- And finally, a 12 liter scuba cylinder that is filled to 200 bar at an ambient temperature of 26C will have the cylinder pressure of 187 bar in water temperature of 7C, because according to Charle's law, P1 x V1 / T1 = P2 x V2 / T2. First, we need to bring everything to the absolute zero though, which entails converting a Celsius into a Kelvin reading (simple – by adding 273C).
ARGH! Shoot me!
At 6PM I decide that I've had enough of this greatness and cook dinner - chicken with 40 cloves of garlic. Like a real chef I modify the recipe… and use only 35 cloves of garlicJ.
No comments:
Post a Comment