Question
Sat January 12, 2013 By: Shabnakp
 

10.2b)explain why the water ona clean glass surface tends to spread out while mercury on the same surface tends to form drops.(put differntly,water wet glass while mercury does not)

Expert Reply
Sat January 12, 2013
Mercury molecules (which make an obtuse angle with glass) have a strong force of attraction between themselves and a weak force of attraction toward solids. Hence, they tend to form drops.

On the other hand, water molecules make acute angles with glass. They have a weak force of attraction between themselves and a strong force of attraction toward solids. Hence, they tend to spread out.

Home Work Help