K
KeithG
Guest
An interesting link: http://www.personal.psu.edu/ref7/apparatus/2003 competition/deardorff-LC.htm
Skip the stuff at the top and scroll down a bit.
Discoveries learned from this device:
· Typical lung pressure ~ 1 m water = 74 mm Hg = 9.8 kPa = 0.097 atm
· The maximum lung pressure of about 1 m of water explains why breathing under water (even with SCUBA gear) is difficult for depths greater than a couple of meters.
· Even Superman could not drink from a straw that is taller than 10.3 m since this is the maximum height of a column of water supported by 1 atm and a perfect vacuum.
· The gauge pressure inside a 9” latex balloon is approximately 20 cm of water (0.02 atm), and is roughly independent of the balloon’s diameter except for the initial inflation. This manometer could be used in an experiment where student take measurements to examine the pressure as a function of diameter.
Skip the stuff at the top and scroll down a bit.
Discoveries learned from this device:
· Typical lung pressure ~ 1 m water = 74 mm Hg = 9.8 kPa = 0.097 atm
· The maximum lung pressure of about 1 m of water explains why breathing under water (even with SCUBA gear) is difficult for depths greater than a couple of meters.
· Even Superman could not drink from a straw that is taller than 10.3 m since this is the maximum height of a column of water supported by 1 atm and a perfect vacuum.
· The gauge pressure inside a 9” latex balloon is approximately 20 cm of water (0.02 atm), and is roughly independent of the balloon’s diameter except for the initial inflation. This manometer could be used in an experiment where student take measurements to examine the pressure as a function of diameter.