8
5-3. Measuring The Density Of A Solid
The density of a solid is obtained by averaging
the measured values.
1. Start the measurement when water temperature
becomes stable.
2. Press the RE-ZERO key to set the displayed
value to zero.
3. Place the sample on the upper pan in air and
record the value A.
4. Press the RE-ZERO key to set the displayed
value to zero.
5. Place the sample on the lower pan in liquid and
record the value B.
Keep the depth of approximately 10 mm
under liquid surface.
6. Obtain the density of water according to the
temperature. (Refer to
Table 1
)
Table 1 Density of distilled water
Temperature
°C
+0 +1 +2 +3 +4 +5 +6 +7 +8 +9
0
0.99984 0.99990 0.99994 0.99996 0.99997 0.99996 0.99994 0.99990 0.99985 0.99978
10
0.99970 0.99961 0.99949 0.99938 0.99924 0.99910 0.99894 0.99877 0.99860 0.99841
20
0.99820 0.99799 0.99777 0.99754 0.99730 0.99704 0.99678 0.99651 0.99623 0.99594
30
0.99565 0.99534 0.99503 0.99470 0.99437 0.99403 0.99368 0.99333 0.99297 0.99259
40
0.99222 0.99183 0.99144 0.99104 0.99063 0.99021 0.98979 0.98936 0.98893 0.98849
50
0.98804 0.98758 0.98712 0.98665 0.98618 0.98570 0.98521 0.98471 0.98422 0.98371
60
0.98320 0.98268 0.98216 0.98163 0.98110 0.98055 0.98001 0.97946 0.97890 0.97834
70
0.97777 0.97720 0.97662 0.97603 0.97544 0.97485 0.97425 0.97364 0.97303 0.97242
80
0.97180 0.97117 0.97054 0.96991 0.96927 0.96862 0.96797 0.96731 0.96665 0.96600
90
0.96532 0.96465 0.96397 0.96328 0.96259 0.96190 0.96120 0.96050 0.95979 0.95906
At sea level (1 atmosphere), the density of water reaches maximum at 3.98 °C.
Unit: g/cm
3
7. Use the following equations to obtain the density.
Three significant digits:
A
ρ
=
×
ρ
0
|B|
Four or more significant digits:
M
ρ
=
×
(
ρ
0
-
d)
+
d
|B|
ρ
: Density of sample (g/cm
3
)
A : Value A : Weight of sample in air (g)
B : Value B : | Weight of sample in air
-
Weight of sample in liquid | (g)
ρ
0
: Density of liquid (g/cm
3
)
d
: Density of air (approx. 0.001 g/cm
3
)
Ex.: Display of HR-AZ
key
Step 2.
Step 3.
Sample in air
Step 4.
Step 5.
Sample in the liquid
key
Value A
Value B
Temperature
Approx. 10 mm
under liquid surface
The upper pan
The lower pan
