WATER |
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| by Ted Peterson |
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| Most of the earth surface is covered by water. Mankind has to have water to live. You can go without food for a time but you cannot go with out water. |
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| A gallon of water will use 230.4 cubic inches of space. A cubic foot of water contains 7 1/2 gallons of water and weight 64.425 lbs. A gallon of water will weigh 8.59 lbs. When you pick up a 5 gallon pail of water you can see that you are picking up 42.95 lbs plus the weight of the pail. A gallon of sea water will weigh .22666 lb more than city water. That is why ships that takes on cargo in ports on rivers like Portland, OR, will stop on their way out and take on deck cargo when they come to the ocean. A ship that weight 40,000 tons in river water will displace 40,00 tons of frash water, that makes the ship draw 11,180 cu. feet less sea water and the ship could carry 559 tons additional cargo on the ship. The large number of ships that loads Honda's for Japan at Portland will stop at Coos Bay and take on logs, etc. for Japan, or go to Seattle for cargo. |
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| Water will freeze at 32 degree and boil at 212 degree at sea lever. These temperatures will change at other then sea level. The boiling point will go down when you go up and go up when you go down. Soon we will have a scale to let you come up with the correct point for the elevation you are at. |
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| Water will be under pressure the deeper it is. It builds up pressure from the weight of the water above. The weight of water pressure can be figured by multipling the height in feet by .433. If you go down below sea level 100 feet (like in a sub), the water pressure will be 433 lb per square inch. They have to build the sub to stand that pressure. Some subs can go down 400 feet or more. |
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| Now we will try to find how much water is in a swimming pool as a test. |
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| If there is a 20 X 10 foot pool that is 3 feet deep at the shallow end and 6 feet at the deep end. What is the weight of water in it. How many gallons. What is the water pressure at both the deep end and the shallow end. |
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| First you have to come up with the cubic feet of water it will take. Take the 20 feet and multiply it by the 10 feet side. That comes to 200 sq. feet. You then need to fine the average depth. It will be 4.5 feet. To come up with this, add both 3 and 6 and then divide by 2. Take this and multiply it by the 200 you came up with above and you will come up with 900 cubic feet. |
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| By going to the table you will multiply 900 x 7.5 (the number of gallons in a cubic foot) and will come up with 6,750 gallons. |
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| You now will take 6,750 gallons and multiply that by 8.59 lb (the weight of each gallon of water), and the total weight of the water in the pool will be 57,982.5 lbs. |
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| The water pressure at the shallow end will be 1.299 lb per sq inch (this is found out by multiplying 3 x .433). The pressure at the deep end will be 2.598 lb per sq, inch, You need to know that the sides of the pool can hold this. |
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