AND HR Series 사용 설명서 - 페이지 8
{카테고리_이름} AND HR Series에 대한 사용 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. AND HR Series 20 페이지. Density determination kit applicable analytical balance models bm/gh/hr-i/gr/hr/ha series
There are several things that can affect the accuracy of a density measurement.
4.1. Buoyancy of Air
A density measurement is influenced by an upward force of 0.0010 to 0.0014 g/cm
air).
The density of air can be obtained by the equation below:
d =
1 + 0.0036728 x t (°C)
When measurement accuracy of three significant digits is necessary, add 0.001 g/cm
measured value to compensate for the error due to the air density.
4.2. Volume of Float
The tolerance of the measured value of the volume of the float is ±0.01 cm
In liquid density measurement, the decimal places beyond the second decimal place of the
measured value contain errors.
When measurement accuracy to the third decimal place or beyond is necessary, measure the
volume of the float using distilled water.
A - B
V =
ρ
ERROR FACTORS
4.
0.0012932
d : Density of air (g/cm
t : Air temperature (°C)
P : Atmospheric pressure (hPa)
- 0.0035
- d
V : Volume of float (cm
A : Weight of float in air (g)
B : Weight of float in liquid (g)
ρ
: Density of distilled water at t°C (g/cm
d : Buoyancy of air at t°C (g/cm
0.0035 : Correction value for the wire (diameter of 1 mm) of the density pan
connecting the upper and lower pans (when the beaker provided
with this kit is used)
P (hPa)
x
1013.25
3
)
3
)
3
)
6
3
(buoyancy of
3
.
3
)
3
to the