How many gallons in your 13 foot x 3.5 foot pool? - Answers

Here's a scientific experiment ... please don't try this without adult supervision: Pour some gallons of water into your pool. Hold a ruler vertical and stick it down into the pool until it hits the bottom. Read the highest wet number on the ruler. Write the number on the back of your hand. Pour some more gallons of water into your pool. Again, stick the ruler down into the pool until it hits the bottom. Again, read the highest wet number on the ruler, and write the number on the back of your other hand. Compare the two numbers on your hands. Are the numbers the same ? Was the water in the pool higher, lower, or same the second time ? Could this result have any connection with the extra water that you poured into the pool the second time ? If I call you on the phone and tell you the length and width of my pool, can you tell how many gallons of water are in it ? Can you tell whether there's any water in it ?