Figure 1 Simple solar cookers in use in Africa.
TopFoto
Ideas about pressure, forces and equilibrium underlie ingenious devices for providing clean water. Calculations involving radiation flux, specific heat capacity and latent heat show what is involved in using solar radiation to distil water and cook food.
In countries around the world where the daily problems are not supermarket queues but the lack of food in the shops, a charity called Practical Action — formerly the Intermediate Technology Development Group — finds practical and ingenious low-cost solutions to the problems of lack of water, food and energy.
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