The Sci Guys: Science at Home - SE3 - EP7: Comparing Surface Tension - Penny Surface Tension

Welcome to science at home episode seven, season three. In this episode we compare the surface tension of multiple liquids by dripping drops of a liquid on a pennies surface. Surface tension can vary a lot between liquids and the bigger the droplet grows before it bursts, the stronger a liquids surface tension is. By the end of this video you will be able to describe what surface tension is, how it helps to create a dome of liquid and why the droplets eventually burst.

Equipment and Ingredients:
Water
Honey
Corn Syrup
Maple Syrup
Olive Oil
Vegetable Oil
Lamp Oil
Cream
Dish Soap
Rubbing Alcohol
Food Colouring
Eye Dropper
Pennies
Small Bowl
Gloves
Lab Coat or Apron
Goggles

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[tiamarczuk]

Lol I have to watch these videos because our science teacher told us to 🧪

[MrSean]

When my son asks "why dose water come back together" the thoughts of how I would have to look it up and refresh my mind on the subject seemed a little exhausting. them I thought... or I could show him a YouTube video saving me solo much time! thanks guys.
also, y'all have the best dry humor I have ever seen.

[thejtlg]

Exactly! This really helps me a lot to do our experiment in Physical Science. Just keep it up!!

[mattmarkarian]

I love this video and surface tension.

[sarahbrady]

In answering the question about the relationship between density and surface tension, Yes- the greater the density, the higher the surface tension. The lower the density, the lower the surface tension.

[AAmorim]

Great video!
It would be nice if you guys explained why high surface tension of water is important to chemical reactions and to life, or even what's the relation between viscosity and surface tension.

[daithiod]

This might just work as a qualitative experiment for the guest junior high school students coming to my school next week, before going on to do a quantitative examination using the Du Nuoy ring method and contact angle determinations as Thanks for the wonderfully simple video of an experiment which I have no doubt young, inquisitive kids really enjoy. I'm old, and I know I'm about to enjoy it!

[kishorejayaraja]

Is there any relation between surface tension, density and viscosity

[KaRs]

+TheSciGuys Thank you guys. You really helped me!

[annoloki]

You forgot something - the reason why the drop count was roughly the same for all liquids (with water being a bit of an outlier) ... as surface tension increases, so does the size of each drop, so the number you're getting is not really to do with the strength of the surface tension, it's to do with the ratio between the end of the dropper and the edge of the coin. For example, a liquid with a surface tension that's twice as strong will form bigger droplets before gravity overcomes this and the droplet falls, so you add more liquid to the coin, so you need fewer drops to transfer the same amount of liquid, hiding the fact that surface tension is greater.

Liquid density plays a greater roll here, as the same surface tension can hold a droplet of lower volume before it breaks off

[leahjones]

Interesting. Thanks! We watched another penny water vid and theirs only held 17 drops. I wonder if the colouring added extra surface tension?

[Flat_Earth_]

Is there surface tension on larger bodies of water like lakes and oceans?

[thomasgauna]

do you guys know what the number of droplets is for resin

[uwoxvvu]

It makes my class interesting for kids.

[cyberpixel]

Does cooking oil have the same surface tension as vegetable oil?

[Ciprian-Amarandei]

the drop size depends on the surface tension. So the water drop will have a larger volume than a drop of alcohol, even if count 42 drops for water and 29 for rubbing alcohol, the volumes are double

[ThorntonEditing]

You guys are awesome, can't believe you have less than 10k subscribers

[naomiemilydavies-brown]

I wish we had this when I was younger.

[annegraham]

How many drops for the chocolate syrup?

[trenton]

So how do they turn baby’s into baby oil