Abstract
The liquid nitrogen cloud demonstration is an effective, dramatic, large-scale demonstration to illustrate gas laws and cloud/fog (aerosol) formations for classes and large-scale outreach events. When performed at full scale, it is common to produce a cloud 20–30 feet in height. Its effect can be further enhanced by adding brightly colored ping-pong balls. Though there are examples on the internet of this demonstration being performed, there is a need for a detailed description of how to perform the demonstration safely at various sizes and of the science behind the phenomenon. This article includes instructions on how to perform the liquid nitrogen cloud demonstration both indoors and a discussion of important safety features. Novel quantitative and spectral data are presented to explore the background science, and a student guided activity is included for use in the classroom.
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