How do you make the perfect sandcastle? A little water can give you a five meter high castle
All children who build sandcastles on the beach know that in addition to sand you also need to add a little water to prevent the structure from collapsing. But why is this? The function of water in sandcastles is to form small 'bridges' which make the grains of sand stick together, thus increasing the solidity of the structure. The researchers show that the optimum amount of water is very small (only a few per cent). If this optimum concentration is used, sandcastles reaching five meters in height can be built....
Source: Science Daily - Thursday, 2 August, 2012
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