B Volume Change With Temperature B - Micromeritics ACCUPYC III Operator's Manual

B V C
OLUME HANGE WITH
Most materials expand when heated. This is true of many sample materials and also for the metal
analysis blocks of the AccuPyc. The AccuPyc software automatically corrects for the change in
sample and reference volume with temperature. If correction of the sample volume is needed, the
calculation below can be applied to the volume reported by the instrument. The verification
standard shipped with the instrument has negligible expansion over the temperature range of the
instrument, so no correction is necessary for that object.
The degree of linear expansion for a material is described by its coefficient of thermal expansion
or CTE. CTE is commonly expressed in units of 10
shown below.
CTE (10
Material
Tungsten Carbide
440 Stainless Steel
6061 Aluminum
The volume that results from thermal expansion is calculated as:
V = V (1 + 3α(T − T ))
0 0
where:
V is the volume at the new temperature
is the volume at the original temperature
V
0
α is the coefficient of thermal expansion
T is the new temperature
T is the original temperature
0
For example, consider a 440 stainless steel object with a volume of 10 cm
volume is:
AccuPyc III Operator Manual
135-42800-01 (Rev -) — Nov 2023
T
EMPERATURE
−6
/K)
5.9
10.1
23.4
B Volume Change with Temperature
−6
/K. Values for some common materials are
3
at 20 °C. At 60 °C, the
B - 1