Which of the following statements are true when two small water drops coalesce to form a bigger drop?
1) The total volume of the smaller drops is equal to the volume of the bigger drop.
2) The total surface area of the smaller drops is equal to the surface area of the bigger drop.
3) The density of the smaller drops is equal to the density of the bigger drop.
4) The temperature of the smaller drops is equal to the temperature of the bigger drop.