The particles of the solid will start changes moving faster on heating and break away from their rigid pattern thus making a liquid. Melting: In this process a solid changes into a liquid on heating.Question: Describe how the states of matter change in terms of the movements of tiny particles.Īnswer: In terms of the movement of particles the changes in states of matter will be as follow: Gases: In gases particles are very loosely packed and they can easily flow from one place to another.This is the reason liquids can take the shape of the container they are poured into. Liquids: In liquids particles are not as closely packed as in solids.Solids: In solids the particles are very closely packed and because of this mostly solids have fixed shape.The arrangement of particles results in three states of matter:. Question: Explain in what way is the arrangement of particles related to the states of matter.Īnswer: All matter is made up of every small particles. On heating the movement of particles increases. Question: How does heating and cooling affect the movement of particles?Īnswer: On cooling the movement of particles decreases Question: List any three processes to show that matter changes from one state to another.Īnswer: The three processes to show that matter changes from one state to another are :. Question: What makes liquids take the shape of the container they are poured in?Īnswer: Liquids take the shape of the container they are poured in because the particles are not as tightly packed as in solids. Question: What is matter made up of?Īnswer: Matter is made up of very small particles. Because of this, there is a rise in the level of liquid inside the capillary as shown.Answer: Any substance that has mass and occupies space. Thus, in order to maintain the same pressure, the liquid in the capillary rushes into the capillary. The shape of liquid meniscus in the capillary is concave.īut the points B and D are at the same horizontal level. Because of this, there is a drop in the level of liquid inside the capillary as shown.Ĭonsider a capillary tube dipped in a liquid which wets the surface. Thus, in order to maintain the same pressure, the liquid in the capillary rushes out of the capillary. The shape of liquid meniscus in the capillary is upper convex.Īs the points A and C are at the same level, the pressure at both these points is the same, and it is the atmospheric pressure.īetween the points C and D, the surface is plane.īut the points B and D are at the same horizontal level. The pressure on the concave side is always greater than that on the convex side.Ĭonsider a capillary tube dipped in a liquid which does not wet the surface. Let p A, p B, p C, and p D be the values of the pressures at the points A, B, C, and D respectively. Iv) Point D is just below the plane surface and outside the capillary, and below the point C. Iii) Point C is just above the plane surface outside the capillary. Ii) Point B is just below the convex surface inside the capillary. I) Point A is just above the convex surface and inside the capillary.
The phenomenon of rise or fall of a liquid inside a capillary tube when it is dipped in the liquid is called capillarity.Ĭonsider the points A, B, C, and D such that On the other hand, if the capillary tube is dipped in a liquid which does not wet its surface the level of liquid in the capillary drops. If one end of a capillary tube is dipped in a liquid which partially or completely wets the surface of the capillary the level of liquid in the capillary rises.
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