Cool bottle, Sudan, 19th century.

 
Cool bottle, Sudan, 19th century.
4 0 c m
 
32cm
actual image size: 24cm x 32cm

Description

This bottle is designed to keep drinks cold on hot days. To work, the bottle must be wet. Water on the side of the bottle evaporates, and this requires energy. The energy is supplied by the bottle and its contents in the form of heat. As they lose heat, they become cooler.

Image Details

Image Ref.
 
10325917

© Science Museum / Science & Society Picture Library

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