Physics, asked by prabhageeta1545, 1 year ago

The permeability of a moulding sand was determined using a standard afs sample by passing 2000cc of air at a gage pressure of 10g/ square cm. If the time taken 1 point for the air to escape was 1 min ,the permeability no is

Answers

Answered by abhi178
7
use formula,

\eta=\frac{v\times h}{P\times a\times t}

where \eta denotes permeability number, v dennotes volume of air passing through specimen(in cm³) , h denotes height of specimen(in cm), P denotes difference between upper and lower surface of test specimen( in cm hg), a denotes cross sectional area of specimen and t denotes time in minutes.

here, v = 2000cc/cm³ , t = 1min, h = 5.08cm, P = 10g/cm² and a =6.4516cm²

so, \eta = 2000 × 1/(10 × 6.4516 × 5.08 )

= 157.48

hence, permeability number is 157.48

rishilaugh: Thanks
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