2B35.70 - Weatherglass Barometer

Fill the weatherglass barometer with colored water 1 to 2 inches above the spout joint. A drop of baby oil into the spout after filling will prevent evaporation from the vessel.
Code Number:
2B35.70
Demo Title:
Weatherglass Barometer
Condition:
Excellent
Principle:
Air Pressure
Area of Study:
Heat & Fluids
Equipment:
Weatherglass Barometer.
Procedure:

Fill the weatherglass barometer with colored water 1 to 2 inches above the spout joint. A drop of baby oil into the spout after filling will prevent evaporation from the vessel.  

References:
  • Thomas B. Greenslade Jr., "The Pneumatic Inkwell and the Barometer", TPT, Vol. 62, #5, May 2024, p. 360.
  • Sebastian J. Spicker, Alexander Kupper, Andre Bresges, "Mission to Mars - Concept and Implementation of a Design-Based (Hands-On) Smartphone Experiment Helping Students Understand the Effects Caused by Differences in Air Pressure", TPT, Vol. 60, #1, Jan. 2022, p. 47.
  • E.R. Reddingius,  "A Simple Barometer",  TPT, Vol. 38, # 5, p. 300, May 2000.
  • Chu E-qing, "A Demonstration to Show the Variation of Atmospheric Pressure with Height", TPT, Vol. 24, # 6, Sept. 1986, p. 354.
  • M. A. Vandyck, "On an Alternative Type of Water Barometer",  AJP, Vol. 57, No. 5, May 1989.
  • "A Homemade Barometer", The Boy Scientist, p. 31.
  • Janice VanCleave, "14, Fountain Machine", Teaching the Fun of Physics, p. 25.
  • Gerard L' E Turner, "The Aneroid Barometer", Nineteenth-Century Scientific Instruments, p. 236- 237.

Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose.  The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources.  Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks.  These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage.  Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.