Making Liquid Nitrogen From Scratch!

TL;DR

The video demonstrates the process of liquifying nitrogen from the air and explains why nitrogen is used to create a uniquely creamy texture in beverages like Nitro Cold Brew.

Transcript

Nitrogen is everywhere. It's a fundamental building block of life. It makes up 78% of the atmosphere, AND it's in these tiny micro bubbles, in my Starbucks 'Nitro-Cold Brew.' And yes, this episode is sponsored by Starbucks. They challenged me to liquify nitrogen out of the air, and that's what I'm gonna be doing in this video. But first I'm gonna t... Read More

Key Insights

• 💄 Nitrogen, which makes up 78% of the atmosphere, can be liquified using a cryo-cooler.
• 🫗 Liquid oxygen can be extracted by exploiting its paramagnetic properties.
• 🫢 A nitrogen membrane with selectively permeable fibers can be used to isolate nitrogen from other gases in the atmosphere.
• 👁️‍🗨️ Nitrogen is used in beverages like Nitro Cold Brew to create smaller, creamier bubbles and prevent reactions with the drink.
• 🍦 The use of liquid nitrogen in homemade ice cream creates a smooth texture with tiny ice crystals.
• 👁️‍🗨️ Nitrogen bubbles in Nitro Cold Brew result in a cascading effect when poured due to the rising bubbles in the center and the downward current around the sides.
• ☠️ The process of creating liquid nitrogen at home requires optimizing flow rate and insulation.

Questions & Answers

Q: How does the cryo-cooler work to liquify nitrogen?

The cryo-cooler consists of a cylinder of helium and pistons that compress and expand the gas, allowing for the absorption of heat from the surroundings. This process results in extremely cold temperatures, which can liquefy gases like nitrogen.

Q: Why is nitrogen used in beverages like Nitro Cold Brew?

Nitrogen is used in beverages to create smaller bubbles that result in a creamy texture. Unlike carbon dioxide bubbles, nitrogen bubbles do not react with the drink, preventing any acidic flavors. The nitrogen bubbles also create an interesting cascading effect when poured.

Q: Why did the host switch to a smaller flask in the nitrogen setup?

The host switched to a smaller flask to slow down the flow rate of the nitrogen, allowing for better cooling and the potential for the production of liquid nitrogen. The smaller size and tight seals also contribute to better insulation.

Q: What is the advantage of using liquid nitrogen to make homemade ice cream?

Liquid nitrogen freezes ingredients very quickly due to its extremely low temperature (-196 degrees Celsius). This rapid freezing results in smaller ice crystals, creating a smoother texture and enhancing the flavor of the ice cream.

Summary & Key Takeaways

• The host attempts to liquify nitrogen using a cryo-cooler, successfully condensing 50 milliliters of liquid air from the atmosphere.

• Liquid nitrogen is created by isolating nitrogen from the atmosphere and cooling it down to extremely low temperatures.

• The process of making homemade ice cream using liquid nitrogen is shown, highlighting the smaller ice crystals and smoother texture achieved through rapid freezing.