Does air have weight?
https://www.nasa.gov/centers/langley/pdf/245898main_MeteorologyTeacherRes-Ch7.r3.pdf

Arlene Levine, National Aeronautics and Space Administration

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The purpose of this hands-on activity is to demonstrate that air has weight and how this fact can be concretely illustrated. Eventually and through more experience gained by conducting mind-engaging activities, the learner will come to a basic understanding that a given volume of air at higher elevations is less dense and has fewer molecules per volume than a similar volume at lower elevations.

Subject: Environmental Science:Global Change and Climate, Geoscience:Atmospheric Science:Climatology
Resource Type: Activities
Grade Level: Intermediate (3-5), Primary (K-2), Middle (6-8)
Theme: Teach the Earth:Course Topics:Environmental Science, Teach the Earth:Incorporating Societal Issues:Climate Change, Teach the Earth:Course Topics:Atmospheric Science