This week we address a listener question about air pressure. What is it? Is the Earth’s atmosphere different thicknesses at different places? Find out, along with the answer to the age old question: “Where are all the teaspoons?”

• International Standard Atmosphere
• Barometric Pressure
• Pascal (unit)
• Scale Height
• Hydrostatic Equation
• Upper Air Maps
• Make a barometer
• Density Altitude

• Lim, Megan SC, Margaret E. Hellard, and Campbell K. Aitken. “The case of the disappearing teaspoons: longitudinal cohort study of the displacement of teaspoons in an Australian research institute.” BMJ 331.7531 (2005): 1498–1500.