Micromeritics ASAP 2020 Confirm Operator's Manual page 412

ASAP 2020 Confirm
To correct cold free space:
where
V
cs
V
cm
M
s
r
s
T
bath
T
std
When you later analyze a sample, select Enter Free Space, and use the values calculated
above.
Example:
The sample is 0.2345 grams of activated carbon with a density of 2.0000 g/cm
temperature is 22 ºC or 295.15 K. The analysis tube has been measured previously in an argon
bath. The measured warm and cold free spaces are 29.1234 and 89.4567 cm
respectively. The analysis will be performed with argon at liquid argon temperature, 87.3 K.
With this information, enter the corrected warm free space as follows:
V = 29.1234 cm
ws
and enter the corrected cold free space as follows:
V = 89.4567 cm
cs
E-2
= calculated cold free space with sample present (in standard cm
= cold free space measured for the empty tube (in standard cm
= mass of the sample to be analyzed (in grams)
= approximate sample true density (in grams/cm
= analysis bath temperature (in Kelvin)
= standard temperature (273.15 Kelvin)
0.2345 g

3
---------------------------------
STP –

2.0000 g/cm
0.2345 g

3
---------------------------------
STP –

2.0000 g/cm
3
)
273.2 K

 ------------------ -
= 29.0149 cm

295.2 K
3
273.2 K


------------------ -
= 89.0898 cm

3 87.3 K
Appendix E
3
)
3 )
3
. The room
3 STP atm-1,
3 1 –
STP atm
3 1 –
STP atm
202-42811-01 - Dec 2013