Viscosity Determination Of Gases - Thermo Scientific HAAKE Instruction Manual

Measuring

9.4 Viscosity determination of gases

The viscosity determination of gases has to be done with ball
G which is made out of glass.
The measuring tube must be closed with rubber stop-
1
pers fitted with glass stopcocks.
Measuring tube, glass ball and gas must be clean and
dry.
The tube is flushed several times with the gas to be
2
tested to push out any remains of air. Then the tube fil-
led with the gas sample is closed with the stopcocks
and raised to the test temperature.
The calculation of the gas viscosity is based on the compari-
son with the viscosity of air at 20  C ( = 181510
= F
G
 1815  10

gas
F
A
where:
: viscosity of the gas at the temperature T

gas
F : falling time of the ball in the gas at the temperature T
G
F : falling time of the ball in air at a temperature of +20C
A
Viscosity of the air at a temperature of +20C:
--5
1815  10 (mPa  s)
16
--5
(mPa  s)
--5
mPas):