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Question: 18 and 20...

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#18 and #20
17. Evaporation and Cooling In the past, when a 20. Adhesion and Cohesion In terms of adhesion and cohesion, explain why alcohol clings to the baby had a high fever, the doctor might have suggested gently sponging off the baby with rub- bing alcohol. Why would this help? surface of a glass rod but mercury does not. 21. Floating How can you tell that the paper clip in 18. Surface Tension A paper clip, which hasa problem 18 was not floating? density greater than that of water, can be made to stay on the surface of water. What procedures must you follow for this to happen? Explain. 22. Critical Thinking On a hot, humid day, Beth sat on the patio with a glass of cold water. The outside
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