Learn how to make a wispy cloud come out of your mouth, even when it's not cold out. Like any awesome trick, physics is to thank for the mouth cloud. This simple and fun demonstration can be used to explain the cloud in a bottle experiment, and real clouds in the sky. instagram.com/thephysicsgirl facebook.com/thephysicsgirl twitter.com/thephysicsgirl physicsgirl.org Help us translate our videos! null Physics Girl has joined PBS Digital Studios! null. Videography: Forbidden Kingdom Digital - forbiddenkingdomdigital.com Editing: Dianna Cowern and Forbidden Kingdom Digital Cloud in a Bottle: Bearded Science Guy Moon and Pluto images: NASA Ten Cloud Images: NOAA Spray bottle footage: soraphotography/shutterstock.com Stock Images: pixabay.com Music: Michael Miller - https://soundcloud.com/michaelrmmiller YouTube - "Ersatz Bossa," "On the Bach" Apple - "Galleria Long" Resources: Cloud Appreciation Society: https://cloudappreciationsociety.org/ Pylon Appreciation Society: http://www.pylons.org/ Biscuit Appreciation Society: http://www.biscuit.org.uk/ Sloth Appreciation Society: http://www.slothville.com/ Hairless Animal Appreciation Society: https://www.facebook.com/HairlessAnimalsAppreciationSociety