Why do solids have any number of free surfaces and gases have no free surfaces at all ? Also compare with liquids.
Kindly refer to the link given below :
https://www.meritnation.com/ask-answer/question/how-many-free-surfaces-do-solids-liquids-and-gases-have-and/matter-in-our-surroundings/8405049
https://www.meritnation.com/ask-answer/question/how-many-free-surfaces-do-solids-liquids-and-gases-have-and/matter-in-our-surroundings/8405049