The Sci Guys: Science at Home - SE2 - EP11: Gay-Lussac's Law of Ideal Gases

Welcome to the eleventh episode of season 2 of The Sci Guys. In this episode we will be using candles, water and a beaker to explore one of the gas laws, named Gay-Lussac's law of ideal gases. We will show you how the temperature and pressure of an ideal gas are directly proportional and explain why gases follow Gay-Lussac's gas law. Gay-Lussac's law specifically works on ideal gases. Examples of gases that act like ideal gases are oxygen, hydrogen and carbon dioxide. At the end of this video you will be able to demonstrate with an experiment how Gay-Lussac's law of gases works and explain how gas molecules react to changes in temperature and pressure.

Equipment and Ingredients:
2 Candles
Beaker or Large Glass
Shallow Dish or Casserole Dish
Butane Lighter
Water
Food Colouring
Goggles
Gloves
Apron or Lab Coat

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[jamaalsmikleyj.]

I guess having two guys doing an experiment called Gay-Lussac's Law would seem skeptical to some. Nice dodge.

[haydnfischer]

Great video guys. Just one thing... the video showes that the Oxygen molecules sink when the flame is extinguished. CO2 has a molar mass that is about 1.6 times larger than the molar mass of O2. The larger molar mass causes the CO2 molecules to "sink, " causing a majority of the lower half of the beaker to be composed of CO2 while the top half is composed mainly of O2. If the Oxygen present in the beaker "sank" as pictured in the video, the candle would stay lit for much longer. Instead, the "sinking" CO2 extinguishes the flame but there is still oxygen present in the beaker. Keep up the great work!

[abdulrasheddabdul]

I am from India. I am a Plus One student. I had to study this in science today. I saw your video while searching. This is a good video. Thanks for being more helpful.

[mariafransisca]

This video really helps me to do my chemistry project :) Thank you so much! U guys are amazing :)

[aspynwolf]

(dude): you're not adam, you're a girl! (adam): Did you just assume my gender?

[brianaxel]

This video really helped me with my physics project. Many thanks, guys!

[cathyschlecker]

This is a poor demonstration of Gay-Lussac's Law, which states that pressure and temperature are directly related when both the volume and the number of gas particles remain constant. In the experiment neither of these factors remain constant. If Gay-Lussac"s Law was the only process at play then one would expect the increase in pressure due to the increase in temperature to push the water out of the beaker. The reason the water flows up into the beaker is because for every two molecule of oxygen consumed one molecule of carbon dioxide and two molecules of water are produced. (again one would expect the water to move out because there are more gas particles) Both the water and the carbon dioxide are initially in the gaseous state. When the flame goes out (because all the oxygen is consumed) the gases cool and some of the gaseous water molecules condense on the inside of the beaker. The pressure decreases because there are fewer total gas molecules in beaker, therefore there is less pressure and this creates a partial vacuum. The air pressure on the outside of beaker is greater than the pressure of the gas molecules inside the beaker and the water is pulled into the beaker until the pressure equalizes. The science is wrong however, love your animated water molecules.

[dericklumaban]

this video really helped me in teaching the concepts of Gay Lussac's Law. thank you for doing the experiment.

[billyesosa]

Hey pls Instead of adding food colour to the water can i just use any soft drink or something else?

[richrocksxbox]

I'm watching this in class right now and I'm board af. PLZ save me.
P's hi mr. debacco

[sokikuong]

This is much better than the last video I watched, those Indian English rlly! Cant understand !!!

[JustAPersonWhoComments]

I came here to learn about the laws :)

[princessjamaicarivera]

What is a good title for this experiment?

[reshmatkreshmatk]

This experiment example fore everyday life

[mrstacyj]

Great animation and narration.  Smart Girls (and Boys) are cool.

[wrhfyfu]

That was really informative, thank you!

[mademoisellek]

Hello po, may I know what's the title or what does this experiment called?

[ellisdunning]

very useful i know everything now. thanks el

[mehers]

Carbon at 2:40 will give me nightmares

[mattmarkarian]

I liked this episode. You Canadians are awesome.