Capillarity by SHAFNA S DEEN

shafnasdeen614 — 2024-02-24 03:11:39 UTC

If you place a white carnation into a vase of water dyed with food coloring, you'll see that as the carnation sits in the dyed water, the petals of the flower will eventually turn the same color as the water.

How this happens?

Capillarity

shafnasdeen614 — 2024-02-24 03:26:56 UTC

Take two boiling tubes, one containing water, and the other mercury. Dip a capillary tube into each.

* What happened to the water level in the capillary tube?

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* What happened to the mercury level in the capillary tube?

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Capillary Depression

shafnasdeen614 — 2024-02-24 03:31:27 UTC

The depression of liquid in a tube is known as Capillary Depression.

What is the cause of the phenomena of Capillary rise and depression?

shafnasdeen614 — 2024-02-24 03:40:42 UTC

* Some insects are able to move along the surface of water.

* A paper Clip remains afloat on the water surface.

* Water drops are spherical in shape.

Surface Tension

shafnasdeen614 — 2024-02-24 03:44:36 UTC

Due to the mutual attraction of the molecules on the surface of water, the surface is stetched like a membrane. The force responsible for this is called Surface Tension.

Cohesive Force

shafnasdeen614 — 2024-02-24 03:53:55 UTC

The attraction between the molecules of the same type is known as Cohesive Force.

Cohesion in mercury

shafnasdeen614 — 2024-02-24 03:54:47 UTC

https://youtu.be/-4SuN26Mktg?si=VNgNh3pPo-RmiMvP

Adhesive Force

shafnasdeen614 — 2024-02-24 03:56:54 UTC

The force of attraction between molecules of different types of substances is called Adhesive Force.

Examples

shafnasdeen614 — 2024-02-24 04:04:04 UTC

* The two liquid drops coalesce to form a single drop due to the attraction between the molecules of the same type.

* Gravitational pull between celestial bodies.

* Intermolecular forces in solids.

Examples

shafnasdeen614 — 2024-02-24 04:08:16 UTC

* When the midrib of a Coconut tree leaf, pencil, etc., are dipped in water and taken out, water is seen sticking to them.

* Fingers are wetted at intervals when currency notes are being counted.

* When a piece of chalk is used on a black board, particles of the chalk stick to the board.

Cohesion vs Adhesion

shafnasdeen614 — 2024-02-24 04:13:11 UTC

https://youtu.be/XCWeNVb6xcI?si=f_jLe9OFgm8PWuCt

Capillary Rise

shafnasdeen614 — 2024-02-24 04:26:51 UTC

The rise of water in a tube against gravitation or against the weight of water is known as Capillary Rise.

Examples

shafnasdeen614 — 2024-02-24 04:43:33 UTC

* Rising of water through a straw.
* Transfer of water from the roots to leaves in plants.
* The rise of any oil in the wick.
* The absorption of water in Sponge.

Example

shafnasdeen614 — 2024-02-24 04:47:45 UTC

* Mercury in a capillary tube shows capillary depression.

Forces acting on water molecules

shafnasdeen614 — 2024-02-24 05:03:19 UTC

* Adhesive Force acts on the water molecules in contact with the sides of the vessel.

* Cohesive Force acts between the molecules of the water surface.

* The Surface Tension is due to the cohesive force between the molecules on the surface of the liquid.

shafnasdeen614 — 2024-02-24 05:05:37 UTC

Capillary Rise occures when the Adhesive Force is greater than the Cohesive Force.

shafnasdeen614 — 2024-02-24 05:08:51 UTC

When the Cohesive Force is greater than the Adhesive Force, Capillary Depression will takes place.

shafnasdeen614 — 2024-02-24 05:11:42 UTC

* Capillary Rise increases with the decrease in the diameter.

shafnasdeen614 — 2024-02-24 05:25:02 UTC

When the diameter of the tube decreases, the weight of the liquid it can contain also decreases. The weight of the liquid in the tube is supported by Adhesive Force. This force depends upon the liquid and the nature of the surfaces it comes into contact with. The adhesive force with the tube is greater than the Cohesive Force of the liquid. So the liquid is able to rise.

shafnasdeen614 — 2024-02-24 05:29:59 UTC

In a bigger tube, as the liquid level rises, the volume increases and subsequently the weight of the liquid also increases. So the Cohesive Force of the liquid will be greater than the Adhesive Force with the tube and the Capillary Rise decreases.

shafnasdeen614 — 2024-02-24 05:34:24 UTC

1. Write down the reason for the following.

a. Ink can be blotted with chalk.

b. Sweat can be blotted with tissue paper.

shafnasdeen614 — 2024-02-24 05:35:44 UTC

2. What is Capillarity? Give some application of Capillarity.

shafnasdeen614 — 2024-02-24 05:37:32 UTC

3. We light lamps using wicks made of cotton cloth. How does the oil rise up along the wick?

1. Make a kerosene lamp using a piece of chalk as shown in the figure and Light it up.

shafnasdeen614 — 2024-02-24 05:40:16 UTC

shafnasdeen614 — 2024-02-24 05:46:51 UTC

1. INTRODUCTION

2. CAPILLARY TUBE EXPERIMENT

3. CAPILLARY RISE

4. CAPILLARY DEPRESSION

5. CAPILLARITY

6. SURFACE TENSION

7. COHESIVE FORCE

8. ADHESIVE FORCE

9. COHESION vs ADHESION

10. FORCES ACTING ON WATER MOLECULES

11. OCCURANCE OF CAPILLARY RISE AND CAPILLARY DEPRESSION

12. FLOW OF WATER IN CAPILLARY TUBES OF DIFFERENT DIAMETERS

13. CAPILLARY RISE IN TUBES OF SMALLER DIAMETER

14. CAPILLARY RISE IN TUBES OF BIGGER DIAMETER

15.CONCEPT MAP

16. SCAN ME

17. LET US ASSESS

18. EXTENDED ACTIVITY

19. REFERENCES

shafnasdeen614 — 2024-02-24 05:55:45 UTC

1. SCERT KERALA STANDARD 9 PHYSICS TEXTBOOK
2. https://www.sciencedirect.com
3. https://en.m.wikipedia.org/wiki/Capillary_action

shafnasdeen614 — 2024-02-27 06:26:09 UTC

Capillarity

shafnasdeen614 — 2024-02-27 06:57:10 UTC

The rise or depression of liquid in a narrow tube or minute hole is known as Capillarity.

Capillary Action

shafnasdeen614 — 2024-02-27 06:57:30 UTC

https://youtu.be/0IzcZ_UWuB0?si=Ks1W6p_sa-C36jrT

shafnasdeen614 — 2024-02-27 07:00:49 UTC

shafnasdeen614 — 2024-03-21 19:40:26 UTC