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The surface tension of "pure" water against air at 20 degrees C is 72.75 dynes/cm. This increases with cooling and decreases with heating. Most inorganic solutes increase the surface tension of the solution when dissolved in water. Most mineral acids decrease the surface tension of the solution in water (sulfuric
acid is the most obvious exception). Most organic compounds decrease the
surface tension of the solution in water (organic acids and alcohols are
often exceptions).
It is important to note that we are talking about increasing and decreasing the surface tensions of solutions of these things in water with respect to distilled water. In order to change the surface tension of distilled water, just changing the temperature will suffice.
PS : At 0 degrees Celsius, the surface tension of water is 75.6 dynes/cm, at
100 degrees it is only 58.9 dynes/cm.
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How does a needle float on water?
the way it float is surface tension!!
How does bubble form?
Can you blow a bubble with pure water? NO WAY... because the surface tension of the water does not allow you to do so.Can you blow a bubble with soap-water solution? YES...Soap molecules contain hydrophobic chains that do not wish to stay in water. so they squeeze out to the surface of water and increases the gap between the water molecules on the surface, there by decreasing the surface tension of the water. With surface tension decreased you can blow a bubble.Here you can ask one more question...Why are Bubbles always spherical and not cuboid or some other shape?
Which is the method used to determine surface tension?
It may be easier to demonstrate surface tension to said 7th grader than explain it. Float a needle on water in a bowl. By way of explanation, the water molecules are "clinging onto each other" in the bowl, and the tiny forces with which they hang onto each other create surface tension. The vast numbers of water molecules hanging onto each other in the water that's in the bowl are acting like a very, very thin piece of fabric or cloth on the surface of the liquid.
What are the different ways on how to reduce and increase frictional force?
Polishing the surface or coating it with a lubricant is a way of reducing friction. To increase friction just hammer some ridges on the surface.
Why does a penny float in water?
The water bubbles up because of cohesion. Cohesion: the force of attraction that holds together a substance's molecules; cohesion is strongest in solids, weaker in liquids, and weakest in gases. The water doesn't spread out evenly all over the penny because the H2O molecules are so strongly attracted to each other (opposites attract, so yeah, hydrogen is pos. and oxygen is neg, so one H2O molecule is attracted to another one, either through the hydrogen molecules or the oxygen molecules) that it forms a bead because they're all grouping up together.
How can a mosquito walk on water?
There are several insects that can walk on water due to the water's surface tension. There are over 300 species of water striders that are able to walk on water, as well as several species of ant.
How does a needle float on water?
the way it float is surface tension!!
How does bubble form?
Can you blow a bubble with pure water? NO WAY... because the surface tension of the water does not allow you to do so.Can you blow a bubble with soap-water solution? YES...Soap molecules contain hydrophobic chains that do not wish to stay in water. so they squeeze out to the surface of water and increases the gap between the water molecules on the surface, there by decreasing the surface tension of the water. With surface tension decreased you can blow a bubble.Here you can ask one more question...Why are Bubbles always spherical and not cuboid or some other shape?
Why needle sinks in water and thread does not even both has equal surface areas?
Actually, its the other way around. A needle will float on water due to surface tension of the water. Thread will not because the fibers of the thread will break the bonds of the surface tension and allow the thread to sink. Also, the thread is not straight as is the needle.
Can copper coin float on water?
A coin can float on the water under a couple of circumstances. The most obvious is if it is made of a material lighter than water. And the second is if it is broad enough that it can be laid on the surface (carefully) and in such a way that the surface tension is not broken.
Why does low-surface-tension-liquids-clean-better than high-surface-tension-liquids?
Low surface tension means high wetting as it represents low contact angle. It is therefore very easy for a low surface tension water / liquid to wet the surface ( usually solid) and get rid of the dirty in a same way a surfactant does unlike a high surface tension liquid which can't wett the surface containing the dirty.... ( answered by MR BANDA) #NOTE i stand to be corrected if any error was made
Which has more surface tension clean water or soapy water?
Yes, pure water is a one molecule based structure, which hold together better than a mixture. When soap or other chemical is added, it breaks surface tension by getting in the way of each water molecule. Try putting water drops on a penny to build a bubble, then add a small drop of soap to it, you'll see that when soap is added, the water bubble collapses.
How do water boatmen use water tension?
To travel with oar-like rear-legs over the water's surface without sinking is a way in which water boatmen use surface tension. Surface tension reflects the elastic film-like, tightly-packed, uppermost watery level which forms from a series of positive hydrogen sides of one molecule attracting negative oxygen sides of another and which thereby lets heavier objects float and move.
What makes water have surface tension?
Surface tension is The attraction of molecules to each other on a liquid's surface? Surface tension of water is the physical property of hydrogen bonding that makes the water molecule. The way that this works is that a water molecule (H2O) is a polar molecule. This is because the oxygen has a much higher electronegative value than the hydrogen. This means that the oxygen gets a lot higher 'share' of the shared electrons than the hydrogen does. This gives oxygen a very high partialnegative charge, and the hydrogen a very high partial positive charge. Because of these high partial charges on each end of the molecule, they are very highly attracted to each other
Name a way to increase the rate at which solids dissolve in water?
you can cut the solid into smaller pieces increasing surface area, heat the water or acidify the water
Which is the method used to determine surface tension?
It may be easier to demonstrate surface tension to said 7th grader than explain it. Float a needle on water in a bowl. By way of explanation, the water molecules are "clinging onto each other" in the bowl, and the tiny forces with which they hang onto each other create surface tension. The vast numbers of water molecules hanging onto each other in the water that's in the bowl are acting like a very, very thin piece of fabric or cloth on the surface of the liquid.
Do wiggle tails come out of water and change into a mosquito or change under water and swim out?
The larvae of .mosquito rise to the surface when about to hatch and use the strong surface tension of the water's surface as a platform to emerge. They must not get wet or they will be trapped in this meniscus.They are light enough to rest on he surface in a similar way to a pond skater whilst their wings inflate and dry.
