BuzzFeed : Using The Schlieren Technique, This Video Allows You To See Things That Are Normally Invisible

For everyone who’s ever wanted to actually see a fart.

The Schlieren technique, achieved by refracting light on objects before a concave mirror, allows you to see things that would usually be invisible — like the heat of a fire, the cold of dry ice, or even a burp.

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Here's what the heat of a lighter actually looks like...

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And here's the chill of dry ice.

BuzzFeedBlue / Via youtube.com

Here's what Isopropyl Alcohol looks like...

BuzzFeedBlue / Via youtube.com

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