. The Ontario high school physics. small quantity of cold water in awatch glass is enclosed in the receiverof an air-pump over a dish of strongsulphuric acid (Fig. 284). The air isthen exhausted from the the pressure is reduced suffi-ciently, the water begins to boil, andas the vapour is removed from the receiver, partly by beingcarried off with the air by the pump, and partly by absorptioninto the sulphuric acid, the process continues until the wateris frozen. Similar results are shown in amore striking manner by the freez-ing of carbon-dioxide by evapora-tion from
. The Ontario high school physics. small quantity of cold water in awatch glass is enclosed in the receiverof an air-pump over a dish of strongsulphuric acid (Fig. 284). The air isthen exhausted from the the pressure is reduced suffi-ciently, the water begins to boil, andas the vapour is removed from the receiver, partly by beingcarried off with the air by the pump, and partly by absorptioninto the sulphuric acid, the process continues until the wateris frozen. Similar results are shown in amore striking manner by the freez-ing of carbon-dioxide by evapora-tion from the liquid form. If theliquefied gas (contained in a strong-steel cylinder) is allowed to escapeinto a bag attached to the outletpipe of the cylinder (Fig, 285), itwill be frozen into snowy cr3stalsby the intense cold producedin the rapid evaporation of theliquid. 292. Practical Applications of Cooling by Vaporization. Vaporization is our chief source of artificial cold. Theapplications are numerous and varied. Fever patients are. Fig. 285.—Freezings of carbon-dioxideby evaporation from the liquid 258 CHANGE OF STATE
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