ExplanationWhen you spin the straw it forces thewater inside to spin. If an object isspinning anything on that objectappears to feel a force pushing itoutward. This pseudo-force is calledcentrifugal force.This means that in your straw the water -is pushed outward and the only way it -can move outward is to move up the thestraw - it is pumped upwards. If youspin the straw fast enough then waterwill exit the straw and fly outwards as itis now moving quite fast.