Measuring The Density Of A Solid - A&D GXA-14 Instruction Manual

5-2.

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)
Temperature °C +0
0.99984 0.99990 0.99994 0.99996 0.99997 0.99996 0.99994 0.99990
0
10 0.99970 0.99961 0.99949 0.99938 0.99924 0.99910 0.99894 0.99877
0.99820 0.99799 0.99777 0.99754 0.99730 0.99704 0.99678 0.99651
20
30 0.99565 0.99534 0.99503 0.99470 0.99437 0.99403 0.99368 0.99333
0.99222 0.99183 0.99144 0.99104 0.99063 0.99021 0.98979 0.98936
40
At sea level (1 atmosphere), the density of water reaches maximum at 3.98 °C.
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 - d) + d
0
|B|
Table 1 Density of distilled water
+1 +2 +3
ρ : Density of sample (g/cm
A : Value A : Weight of sample in air (g)
: Value B : | Weight of sample in air - Weight of sample in liquid | (g)
B
ρ : Density of liquid (g/cm
0
d : Density of air (approx. 0.001 g/cm
Sample in air
key
Step 2.
Ex.: Display of GX-A
Step 3.
Value A
key
Step 4.
Step 5.
Value B
+4 +5
3
)
3
)
7
Temperature
The upper pan
The lower pan
Approx. 10 mm
under liquid surface
Sample in the liquid
+6 +7 +8
0.99985 0.99978
0.99860 0.99841
0.99623 0.99594
0.99297 0.99259
0.98893 0.98849
3
)
+9
3
Unit: g/cm