Description

APPARATUS OF MEASURING VOLUME

Technical Field

[1] The present invention relates to a volume measuring apparatus.

Background Art

[2] The present invention relates to a volume measuring apparatus, and, particularly, to a volume measuring apparatus which can be used to measure the volume of an object accurately and conveniently.

[3] Generally, density is a basic property of an object, and can be calculated from the measured values of volume and mass. When the volume and mass of an object are measured in order to calculate density, mass can be easily and accurately measured to a highly precise value using a common and widespread electric balance, but volume is relatively difficult to measure, and thus it is difficult to precisely determine a volume as long as the object does not have a specific shape, such as a rectangular parallelepiped, a sphere, or the like.

[4] A conventional mass cylinder may be used to measure the volume of an object having various shapes. However, since the mass cylinder has a long cylindrical form, the mass cylinder is problematic in that when the diameter of the mass cylinder is small, the volume of the object can be precisely measured, but large-sized objects cannot be introduced into the mass cylinder, and conversely, when the diameter thereof is large, large-sized objects can be introduced thereinto, but the volume of the object cannot be precisely measured. Disclosure of Invention Technical Problem

[5] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and the present invention provides a volume measuring apparatus which can be used to conveniently and accurately measure the volume of an object, the volume of which cannot be easily measured because the shape thereof is not regular.

Advantageous Effects

[6] A volume measuring apparatus according to the present invention can be used to conveniently and accurately measure the volume of an object, the shape of which is not regular. Further, the volume measuring apparatus is advantageous in that since it has a simple structure, it can be conveniently manufactured, and thus it can be widely distributed at low cost. Brief Description of the Drawings

[7] FIG. 1 is a perspective view showing a volume measuring apparatus according to the present invention; [8] FIG. 2 is a front view showing a volume measuring apparatus according to the present invention; [9] FIG. 3 is another front view showing a volume measuring apparatus according to the present invention; and [10] FIG. 4 is a front view showing the method of using the volume measuring apparatus according to the present invention.

[11] <Description of the elements in the drawings>

[12] 10: cylinder

[13] 11: graduated tube connection part

[14] 11': inner portion of graduated tube connection part

[15] 12: introduction part

[16] 12' : inner portion of introduction part

[17] 13: minimum water level indication line

[18] 14: maximum water level indication line

[19] 15: maximum water level indication line

[20] 16: water

[21] 17: samples for volume measurement

[22] 20: graduated tube

[23] 21 : lower end of graduated tube

[24] 22: protrusion of graduated tube

[25] 23: graduated tube

[26] 24: upper end of graduated tube

[27] 30: piston

[28] 31 : lower end of piston

[29] 32: protrusion of piston

[30] 33: lower end of piston

Best Mode for Carrying Out the Invention [31] Hereinafter, the present invention will be described in detail with reference to the attached drawings. [32] The present invention provides a volume measuring apparatus, and particularly a volume measuring apparatus that can be used to accurately and conveniently measure the volume of an object. [33] As shown in FIG. 1, the volume measuring apparatus according to the present invention includes a cylinder 10, a graduated tube 20 and a piston 30, and is used by connecting the graduate tube 20 and the piston 30 to the cylinder 10. The entire volume

measuring apparatus is formed of transparent materials such that the water level therein can be observed.

[34] The cylinder 10 includes an introduction part 12 and a graduated tube connection part 11. The cylinder 10 is configured such that the piston 30 is connected to the introduction part 12 and the graduated tube 20 is connected to the graduated tube connection part 11. Since the introduction part 12 is used to introduce an object to be measured and water thereinto or to draw them therefrom, it is preferred that it be fabricated in a large size, so that a large sized object can be introduced thereinto. The cylinder 10 is marked with a minimum water level indication line 13 and maximum water level indication lines 14 and 15 which correspond to the boundaries of the range of water levels within which graduations 23 can be read.

[35] The graduated tube 20 has a slender and long tubular shape, and is used by connecting the lower end 21 thereof to the graduated tube connection part 11 of the cylinder 10. Since the graduated tube 20 is marked with graduations 23 at regular intervals, the volume of an object can be measured. The upper end 24 of the graduated tube 20 is formed to be relatively wider than the lower end thereof in order to prevent water from overflowing, and it has a bell-like shape. Further, since a protrusion 22 is formed in an outward direction at a location spaced a predetermined interval apart from the lower end of the graduated tube 20, the graduated tube 20 can be laid on the graduated tube connection part 11 of the cylinder. Meanwhile, as shown in FIG. 2, graduated tubes having various lengths may be formed, a graduated tube corresponding to the volume of an object to be measured may be selected from the graduated tubes having various lengths, and then the selected graduated tube may be connected to a cylinder. The cylinder is marked with the maximum water level indication lines 14 and 15 corresponding to each of the graduated tubes.

[36] The piston 30 is used by connecting it to the introduction part 12 of the cylinder 10.

Since a protrusion 32 is formed in an outward direction at a location spaced a predetermined interval apart from the lower end of the piston 30, the piston 30 can be laid on the introduction part 12 of the cylinder 10. Further, since the lower end 33 of the piston 30 is obliquely formed, air does not enter the cylinder 10, and is discharged therefrom through the graduated tube 20.

[37] Here, the inner portion 12' of the introduction part of the cylinder is connected to the lower end 31 of the piston, and the inner portion 11 ' of the graduated tube connection part of the cylinder is connected to the lower end 21 of the graduated tube. They are surface-treated to prevent water from leaking, like the contact portions between a cylinder and a piston in a general glass syringe.

[38] Alternatively, the piston and the graduated tube may be placed over the cylinder by forming the piston and the lower and upper portions of the graduated tube such that the

thicknesses thereof are different from each other, as shown in FIG. 3, instead of forming a protrusion on the piston and the graduated tube as shown in FIG. 2.

[39] [Method of using the volume measuring apparatus]

[40] [1st step] A dried volume measuring apparatus is provided, a graduated tube is connected to a cylinder, and then water 16 is put into a cylinder through an introduction part of the cylinder up to a water level line which is a little higher than a minimum water level indication line 13.

[41] [2nd step] A piston is connected to the cylinder, and then the graduation 23 ¹ corresponding to the water height of the graduated tube is read.

[42] [3rd step] The piston is separated from the cylinder, a sample 17 to be measured is put into the introduction part, and then the fact that water height is not above a maximum water level indication line 14 marked on the cylinder is confirmed. When the water height is above the maximum water level indication line corresponding to the graduated tube, the graduated tube currently being used is replaced with a different graduated tube which is fabricated to measure a larger volume, and then the measuring process is repeatedly performed from the 1st step.

[43] [4th step] The piston is connected to the cylinder, and then the graduation 23 corresponding to the water height of the graduated tube is read.

[44] [5th step] The difference between the graduation 23 ¹ read in the 2nd step and the graduation 23 read in the 4th step is calculated, thereby calculating the volume of the object.

[45]

[46] Hereinafter, the present invention will be described in more detail with reference to

Examples.

[47] [Example 1]

[48] 9.79 g of a copper sample having a density of 8.90 g/cm was provided, and the volume of the copper sample was measured using the volume measuring apparatus of the present invention and a 100 ml mass cylinder having a diameter of 27 mm, five times each. The errors and error rates of the volume of the copper sample to the theoretical volume thereof, which is 1.10 cm , were calculated, and the results thereof are given in Table 1.

[49] [Example 2]

[50] 5.94 g of an aluminum sample having a density of 2.70 g/cm was provided, and the volume of the copper sample was measured using the volume measuring apparatus of the present invention and a 100 ml mass cylinder having a diameter of 27 mm, five times each. The errors and error rates of the volume of the aluminum sample to the theoretical volume thereof, which is 2.20 cm , were calculated, and the results thereof are given in Table 2.

[51] [Example 3] [52] 9.70 g of a plastic sample having an unknown density was provided, and the volume of the copper sample was measured using the volume measuring apparatus of the present invention and a 200 ml mass cylinder having a diameter of 35 mm, five times each. The density of the plastic sample was calculated based on the results of each set of measurements of the volume thereof, the deviation rate of the density thereof to the average density thereof was calculated, and the results thereof are given in Table 3.

[53] Table 1

[54] Since the volume measuring apparatus of the present invention has graduation units of 0.01 cm , it is able to measure the volume of a sample to a unit of approximately

3

0.001 cm . Further, since the mass cylinder has graduation units of approximately 0.1 cm , it is able to measure the volume of the sample to a unit of approximately 0.01 cm . In Table 1, the errors and error rates of the volume of the sample were calculated by comparing the theoretical volume, 1.10 cm , of 9.79 g of copper having a density of 8.90 g/ cm with each of the measured volumes of the sample. In the volume measuring apparatus of the present invention, the average error rate thereof was 0.82%, and, in the mass cylinder, the average error rate thereof was 16.55%.

[55] Table 2

[56] Since the volume measuring apparatus of the present invention has graduation units of 0.01 cm , it is able to measure the volume of a sample to a unit of approximately 0.0 01 cm . Further, since the mass cylinder has graduation units of approximately 0.1 cm , it is able to measure the volume of the sample to a unit of approximately 0.01 cm . In Table 2, the errors and error rates of the volume of the sample were calculated by comparing the theoretical volume, 2.20 cm , of 5.94 g of aluminum having a density of 2.70 g/cm with each of the measured volumes of the sample. In the volume measuring apparatus of the present invention, the average error rate thereof was 0.43%, and, in the mass cylinder, the average error rate thereof was 11.80%.

[57] Table 3

[58] Since the volume measuring apparatus of the present invention has graduation units of 0.01 cm , it is able to measure the volume of the sample to a unit of approximately 0.001 cm . Further, since the mass cylinder has graduation units of approximately 0.2 cm , it is able to measure the volume of the sample to a unit of approximately 0.02 cm . As given in Table 3, in the volume measuring apparatus of the present invention, the density of the plastic sample is 1.51 g/cm , and, in the mass cylinder, the density thereof is 1.45 g/cm . In the volume measuring apparatus of the present invention, the deviation rate of the density of the plastic sample to the average density thereof, 1.51 g/cm , was 0.53%, and, in the mass cylinder, the deviation rate of the density of the

plastic sample to the average density thereof, 1.45 g/cm , was 7.72%. [59] As described above, the error rate of the samples measured using the volume measuring apparatus according to the present invention is 1/14 ~ 1/27 that of the conventional mass cylinder, and thus it can be seen that the volume measuring apparatus has higher accuracy than the mass cylinder.