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[PSUBS-MAILIST] ATM Pres Chart 1

Alan, here's a chart that might be useful if you use an altimeter to measure the vacuum.  It looks like 53,000 ft. would be 1.47 psi and 101,000 ft. would be .147 psi.  Hopefully the e-mail transmission won't distort it too much.
-JT
 

fraction of 1 atm

average altitude

(m)

(ft)

1

0

0

3/4

2,750

9,022

1/2

5,486

18,000

1/3

8,376

27,480

1/10

16,132

52,926

1/100

30,901

101,381

1/1,000

48,467

159,013

1/10,000

69,464

227,899

1/100,000

86,282

283,076