Question

#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

Answer 1

A paper clip which hey a density greater than that of water, can be made to stay on the surface of water because of the surface tension of water. If we look closely at an object suspended by surface tension, weather it is a paper clip, infect, leaf , we will native a slight depression in the surface which produces resultant surface tension at the up ward direction which balances the weight of the object. As long as the pressure exerted by on object is low enough, surface tension can support it. Confession is the tendency of male to be attracted to similar male and Adhesion is the tendency of male to be attracted to dis similar male Adhesion force between glass and water male is grater than the canes ion force between water male. For trip reason it to the surface of the glass rod. It is same as for the alcohol. The Adhesion force between glass and mercury