# Can any one explain the physical concepts to the process of making ice without refrigeration?

as stated in

“The process of making ice in the East Indies at Allahabad, Mootegil, and Calcutta”.

On a large open plain, three or four excavations were made, the bottoms of which were sugar-cane, or the stems of the large Indian corn dried. Upon this bed were placed in rows, a number of small, shallow, earthen pans, for containing the water intended to be frozen. These are unglazed, and made of a prous Earth. Towards the dusk of the evening, they were filled with soft water, which had been boiled, and then left in the afore-related situation.

The ice-makers attended the pits usually before the sun was above the horizon, and collected in baskets what was frozen.

• If you read on it tells you that it is evaporation, the same process by which swearing keeps you cooler. Evaporation of the water occurs at the surfaces of the porous pots. Evaporation requires energy which it takes from the remaining water left in the pots and if enough energy is taken from the water it starts to freeze. – Farcher Feb 9 '17 at 16:58