When some useless work is done it is commonly said that it is the same as carrying water in a sieve.
When can water really be carried in a sieve without it seeping through? What is the maximum height of the water layer that can be carried in a sieve if the diameter of the mesh is d = 1 mm? Can the water poured into a sieve be drained over its edge? The surface tension of water is α = 70 cyn/cm.
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Sol. The water will not pour out if: the sieve is made of a water repellent material; if the height of the water layer in the sieve does not exceed
h 0 = 
3 cm
If the height of the sieve is less than h 0 the water can be drained; when the height is larger than h 0 , then, if the sieve is inclined, a layer of water deeper than h 0 forms near its lower edge and the water begins to seep through the meshes of the sieve.
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