1. Fill the 2 gallon container with water. 2. Pour all the water in the 2 gallon container into the 3 gallon container. 3. Refill the 2 gallon container 4. Fill the 3 gallon container the rest of the way with the 2 gallon container. You will have 1 gallon left in the 2 gallon container without using the 5 gallon container. P.S Whose bomb are you trying to defuse?

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The gas fills the container, therefore its volume must be 2 cu ft.

Place container (3) beside container (6) at the bottom

Place container (2) above the other container (3) place it in middle

Left most pipe (2) route it with elbows until the down pipe then place a right elbow to fill container (3) at the bottom

2nd pipe (2) place a left elbow to fill container (2)

3rd pipe (3) place a left elbow to fill the container below container (2)

pipe (1) elbow around the right side to reach the middle to fill bottom container (3)

all of it - the air would expand to fit the entire container.