Surface tension lab experiment

Making water molecules stick together less is what helps soaps clean dishes and clothes more easily. Conclude with team-to-team presentations and discussions of lab techniques, procedures and results, and have students create summary documents.

Now carefully add one drop of water at a time to the top of the penny. For example, they might measure how large the bubble is, how long it lasts, or how far it floats once it leaves the wand. Procedure Fill the medicine dropper with water.

The lesson provides photos, short videos and background information on surface tension, adhesive forces and engineering applications. So at the surface, the liquid molecules move to create the least surface area possible, as a way to minimize the stretching of the skin, and lower the amount of energy in tension on the surface.

Procedure Background Droplets form due to the surface tension of the liquid—a larger surface area requires more energy to maintain due to the molecular forces associated with surface tension.

Measure Surface Tension with a Penny

What makes a good soap bubble? Hold the medicine dropper just above the top of the penny not touching it so each new drop has to fall a short distance before it merges with the drop on the penny. Keep adding drops refill your medicine dropper as necessary one at a time.

Assign the math homework, as described in the Assessment section. How many drops of water do you think will fit on top of the penny?

The water forms into round drops not cubes or any other shape because spheres are the shape with the least amount of surface area for a given volume of liquid. Do you think you will be able to add more drops or less before the liquid spills over the sides of the penny?

What have we observed by closely examining falling water such as from a faucet or hose? How well did it work? Listen to student answers; recap with points below, as necessary: Again, slowly add one drop at a time.

How big does the drop on the penny get before it finally spills over the edges? Observations and results You should find that plain tap water produces a much larger, stable drop of water on top of the penny than the soapy water does.

Try the experiment with different liquids or other things you can find in your kitchen.

Let them describe whether or not the solutions worked, and how well they worked. Usually, some students have done this. Mix a small amount of dish soap with your tap water.

And so falling water and the sprayed ink in inkjet printers forms into spheres. Getting the surface tension just right to make a really good soap bubble can be tricky.

Fill a glass, cup or small bowl with tap water. You can write down the number of drops you add if you like. Water molecules really like to stick together and that causes water to act the way it does.

With the most or least number of drops? Have you ever tried to make your own soap bubble solution? Soap and Water Bubbles:Surface tension is a phenomenon in which the surface of a liquid, where the liquid is in contact with gas, acts like a thin elastic sheet.

This term is typically used only when the. Measure Surface Tension with a Penny. This creates "surface tension." The surface of the water droplet is held together by the attraction between molecules.

Try the experiment with. In today's Lab Report, sponsored by Apologia Science, we'll experiment with the surface tension and cohesion properties of water.

Soap is a surfactant, or a compound that lowers the surface tension of a liquid. Soap, in particular, decreases the surface tension of water by weakening the hydrogen bonds that make water such a.

Surface tension is the energy, or work, required to increase the surface area of a liquid due to intermolecular forces. Since these intermolecular forces vary depending on the nature of the liquid (e.g.

water vs. gasoline) or solutes in the liquid (e.g. surfactants like detergent), each solution exhibits differing surface tension properties. Because surface tension can be defined as the work needed to increase the surface per unit liquids having strong intermolecular forces will be expected to have higher surface tensions since greater work will be required to break these forces in order for the molecules to be able to come into the surface.5/5(1).

Surface tension lab experiment
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