10 Water drops merge to form a single drop. In this process...
a) Energy is absorbed
b) Energy is liberated
c) Energy is neither absorbed nor liberated
d) Total surface area increases
Answers
Answer:
We know that the volume of sphere is
3
4
πr
3
We know that the surface area of sphere is 4πr
2
When the two droplets merge, their volume gets added. But their total surface area decreases. For convenience, assume that the 2 droplets are equal in size and their radius is r. Consider the large drop's radius is R.
Calculate their before and after surface area. You will realise that their surface area decreases.
In the case of a droplet, it is spherical and its surface is exposed to air. The molecules on the surface experience an inward force and hence the surface tries to contract. Since it cannot contract beyond a point the surface remains under tension. This tension is in the form of surface energy. When the two droplets merge, their surface area decreases and hence total surface energy decreases. The remaining energy is liberated.
When the two droplets merge, their volume gets added. But their total surface area decreases. For convenience, assume that the 2 droplets are equal in size and their radius is r. Consider the large drop's radius is R.
Calculate their before and after surface area. You will realise that their surface area decreases.
In the case of a droplet, it is spherical and its surface is exposed to air. The molecules on the surface experience an inward force and hence the surface tries to contract. ok it's ur wish whether u want to continue this or ending up everything not but I'll wait for ur text, if u ever want to talk just text me over telegram VABHI2001, save this username bcz mods are deleting my answer again and again. Since it cannot contract beyond a point the surface remains under tension. This tension is in the form of surface energy. When the two droplets merge, their surface area decreases and hence total surface energy decreases. The remaining energy is liberated.