Pressure of the tank?

[Ockly]

Let say if you have a 4ft tank fill with water and the another fill with sand, which tank will have more pressure on the side glass?

[loupgarou]

well. lets assume sand distributes evenly the weight. (as opposed to being distributed against the bottom.

then whichever is denser.

ie: 1 litre of sand weighs more than 1 litre of water.

however. consider that sand doesn't apply pressure equally against the sides. ..

well. your guess is good as mine..