Expansion of Liquids - Objective, Procedure,Science Experiments :
Objective:
(1) Students infer that liquids expand on heating. (2) Students differentiate between apparent expansion and real expansion in liquids.
A round bottom flask is a container with a round bottom that is used to hold liquids. It has three parts: the body, the neck, and the cap. The cork is used to seal the flask and prevent any leakage. The glass tube is placed into the neck of the flask so that it extends up from it. This tube can be filled with liquid or gas before sealing off the opening of the neck with a cork.
The level of liquid in a round bottom flask can be seen by looking at how much liquid comes up in its glass tube. When you fill up your glass tube, you should make sure that it does not go past this certain level because if it does, then there will be spillage when you seal off your flask's neck with its cork.
Principle:
Expansion of liquids on heating.
Chemicals and Apparatus Required :-
1] Round bottom flask
2] One holed cork
3] Glass tube
4] Spirit lamp
A round bottom flask is a type of flask that has a round bottom and is used for the study of liquids. It is an apparatus used in laboratory experiments. The round bottom flask has a narrow neck and wide, cylindrical body that tapers to the bottom.
The cork seals the opening of the flask so that liquids cannot escape or evaporate, but gases can be exchanged.
The glass tube is connected to the top of the round-bottom flask, which allows gases to escape but prevents any liquid from escaping.
Certain level refers to a certain height at which liquid will just not go any higher up in this type of apparatus due to gravity.
Liquids expand when heated. This is due to the change in the average kinetic energy of molecules. When a liquid is heated, its temperature increases and so does the average kinetic energy of its molecules. The increased kinetic energy of the molecules causes them to move faster and farther away from each other. This results in an increase in volume of the liquid.
Procedure:
A round bottom flask is filled with water and fitted with a cork. A glass tube with a small Pore opened at both ends is passed through the cork. The liquid rises to a certain level in the tube. It is marked as A. The liquid is heated by heating the flask.