It depends on the size of the tank. The standard tank used at most scuba diving training facilities use an aluminum 80. The tank weighs around 21 lbs. full. As the tank is used during diving it becomes more boyant, meaning that you need to use more weight at the end of the dive then you need at the beginning.
they weight the same if they are both 100 lbs.
the weight of the tank will be about 100 pounds
The diver uses an air tank, which is a tank filled with compressed air. It has a hose that goes from the tank to the mouth, which is held in the mouth by a 'mouth piece'. The tank has a regulator that allows the pressure in the tank to be regulated down for normal breathing.
No. If the water doesn't overflow, then the addition of the fish will increase the total weight of the tank and its contents by 50 pounds.
Steel has been used as a tank material since the begining of scuba diving. Extremely durable and useful as a tank material but steel rusts. Buy a steel tank, assume that over the life of the tank it will cost you for a few tank tumbles to remove interior rust. Pay more for a steel tank than an aluminum one. Steel will last (almost) forever if you take care of it. There are steel tanks still in service today that were originally manufactured in the 50s. Aluminium tanks came out in the 70s. It's a softer material, the walls of aluminum tanks are thicker, making them a little larger than steel tanks of the same capacity. The big advantage of aluminum is that it doesn't rust and it's less-expensive than steel. You can find aluminum tanks cheap, for $100-150.
When the rock is placed in the tank of water, the total weight will remain the same at 100 pounds. This is due to Archimedes' principle, which states that an object submerged in a fluid experiences a buoyant force equal to the weight of the fluid displaced by the object, thus offsetting the weight of the rock.
A very big pool, or a large tank.
A 100-gallon fish tank weighs approximately 834 pounds when filled with water. The weight of the tank itself can vary depending on the material it is made of, but the water alone would weigh around 8.35 pounds per gallon.
the weight of the water above. water in a 1" pipe 100' tall is 43 psi @ base of pipe. water in a 50' tank 100' tall is 43 psi @ base of tank. h x .434 = psi
"A standard 100 lb propane bottle contains 90 litres of propane. " http://www.uniongas.com/business/otherci/techsol/heating/constructionheat/conHeatCostComp.asp
100 pounds per square foot (also denoted 100 psf) is most likely a pressure value. Think of it as having a block of steel 1 ft by 1 ft, weight of 100 pounds, and placing it on a flat surface. The pressure on the flat surface from the block of steel equally distributed over the 1 square foot area is 100 psf.