. Elementary physics and chemistry: second stage . Fig. 4.—One way in which evaporation is utilised. the sun and air soon become quite dry. Streams and rivers, ponds and lakes, are shallower during the hot days of summer than they are in other months of the year. It is a common practice to expose shallow vessels of water in rooms which are warmed during winter by coke or gas stoves. From time to time such vessels have to be refilled, for the water quickly disappears and exists in an invisible form throughout the air of the room. Nearly everybody has observed the same process taking place when
. Elementary physics and chemistry: second stage . Fig. 4.—One way in which evaporation is utilised. the sun and air soon become quite dry. Streams and rivers, ponds and lakes, are shallower during the hot days of summer than they are in other months of the year. It is a common practice to expose shallow vessels of water in rooms which are warmed during winter by coke or gas stoves. From time to time such vessels have to be refilled, for the water quickly disappears and exists in an invisible form throughout the air of the room. Nearly everybody has observed the same process taking place when sitting still after some violent exertion. The perspiration, which after the exercise stands in drops over the face and body,
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1900
