2008/07/16 by G. Santostasi, Giovanni Santostasi, Declan Hughes +22
Physics and Astronomy · #Atmospheric and Oceanic Physics (physics.ao-ph) #Experimental and Theoretical Physics Studies #FOS: Physical sciences #Physics Education (physics.ed-ph) #physics.ao-ph #physics.ed-ph
paper · pdf · doi:10.48550/arxiv.0807.2491
9 pages, 7 figures
arxiv created 2008/07/16 · openalex publication_date 2008/07/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Relatively inexpensive and readily commercially available equipment (such as digital recorders, MP3 portable speakers and tie-pin microphones), allowed a team of students from McNeese State University to measure the speed of sound in the atmosphere as a function of altitude. The experiment was carried as a payload (in the context of a NASA funded student program called La-ACES) on a high altitude balloon that reached a maximum altitude of 101,000 feet. Not withstanding substantial environmental noise, our particular experimental design allowed for the filtering of the signal out of the noise, thus achieving remarkable accuracy and precision. The speed of sound measurement was then used to set limits on the abundances of the main molecular components of the atmosphere (diatomic nitrogen and oxygen). Bayesian analysis was used to set meaningful values on the uncertainty of our limits. It is our experience that students find intutive and appealing this type of probability method.