Scuba Diving Gear

Scuba Pressure Gauge

PHYSICS (pressure) toooo HARD!!?

A scuba tank has a volume of 3570 cm3. For very deep dives, the tank is filled with 50 percent (by volume) pure oxygen and 50 percent pure helium. How many oxygen molecules are there in the tank if it is filled at 20oC to a gauge pressure of 12.0 atm? solution??

1) Calculate the volume of 1 mol of gas in the scuba tank.
Under standard conditions (1atm, 0 C) 1 mol of gas has a volume of 22.4 dm^3. Using the gas law pV=nRT we deduce that at 20 C, 12 atm 1 mol gas has a volume of 22.4* (293/273) / 12 = 2.00 dm^3.
The latter volume equals 2000 cm^3.

2) Calculate the number of mol of oxygen in the scuba tank.
The volume of oxygen in the tank is 3570/2 = 1785 cm3.
This is 1785/2000 = 0.8925 mol.

3) Calculate the number of oxygen molecules.
1 mol equals 6.022 x 10^23 molecules (Avogadro's number).
In the tank are 0.8925 x 6.022 x 10^23 = 5.37 x 10^23 molecules.

Pressure Gauge $180.99 Pressure Gauge; Flat; Dual; White;

Scuba $13.53 Scuba

AirForce Scuba Refill Clamp with Gauge $78.6 Scuba yoke fill station 1/4" AirForce tank adapter Fits scuba tank with standard k-valve 1" diameter micro-gauge reads from 1-5,000 psi across one-third of the gauge face Product may not look exactly like the one shown. Universal! Fits long- & short-necked scuba tanks!

Portex Cuff Pressure Gauge $138.32 Portex Cuff Pressure Gauge

Respironics Pressure Gauge $58.39 Respironics Pressure Gauge

Fuel Pressure Gauge $43.99 Fuel Pressure Gauge

Scuba Fill Station $54.99 "Used to fill High-Pressure Systems From a Scuba Tank. For use with scuba tanks using the American Valve System. This adapter features a quick disconnect, tension knob, seal ring and a bleed knob to drain the system. "

AirForce Scuba Tank Adapter K-valve, Steel Hose $102.6 AirForce Airguns scuba tank adapter K-valve Pressure gauge goes up to 3,000 psi Stainless steel mesh hose* Ends in a female quick-disconnect *While the hose is stainless steel mesh, it MAY also have a black plastic cover. Which one you get depends on what we have in stock.

AirForce Scuba Tank Adapter, DIN Connector, Steel Hose $102.6 AirForce Airguns scuba tank adapter DIN connector Pressure gauge goes up to 3,000 psi Stainless steel mesh hose* Ends in a female quick-disconnect *While the hose is stainless steel mesh, it MAY also have a black plastic cover. Which one you get depends on what we have in stock.

Fuel Pressure Gauge Kit $75.99 Fuel Pressure Gauge Kit; w-Fuel Injection;

Portex Cuff Pressure Gauge Tubing $69.16 Portex Cuff Pressure Gauge Tubing

Account limit of 2112 requests per hour exceeded.

making a scuba pressure gauge or SPG

is a spray can Hydraulic or pneumatic?

also: a hydrofoil, piston pump, fire extinguisher, dishwasher, car brakes, airplane wing, dentist's drill, rocket, vacuum cleaner, hydraulic lift, scuba gear, dam, tunnel construction, blood pressure, toilet tank, helicopter, four-stroke engine, refrigerator, airplane, aneroid barometer, airship, pneumatic drill, jet engine, hovercraft, kite, hydroelectric turbine, bourdon gauge, rotary pump, hot-air balloon, carburetor, air conditioner and brass instruments. please help due monday!!

The answer is basically pneumatic but a spray can is basically a hybrid. A hydraulic system requires an ancillary source to pressurize the fluid (like a pump or gas pressure). A spray can has a fluid in it but the fluid is propelled by a gas under pressure inside of the can. However, the fluid traveling up the down-tube is capable of doing work so there is a hydrulic component.
hydrofoil - hydraulic
piston pump - either
fire extinguisher - same as a paint can
dishwasher - hydraulic
car brakes - hydraulic
airplane wing - pneumatic
dentists drill - pneumatic or mechanical
rocket - pneumatic
vacuum cleaner - pneumatic

You get the idea
.