KR20010046563A - Apparatus for oxygen detection in air - Google Patents

Abstract

PURPOSE: A device for measuring an oxygen amount in the air is provided to simplify a complex testing process, to reduce various experimental tools, to reduce an experiment period of time, to easily obtain volume of oxygen in the air and to minimize error of experiment value. CONSTITUTION: A device for measuring an oxygen amount in the air includes two acrylic cases(1,2) having a larger-sized tube and a smaller-sized tube. The larger-sized tube scales attached on three sides of the tube and divided into 13 parts. The scale indicates 130%. The tube scales has a standard line(3) indicated as 0 at a portion where the tube is 30% from a lower part. An upper portion of the larger-sized tube is blocked with an acrylic plate and a central part of the larger-sized tube has a hole(4). The smaller-sized tube has a size of 7/13 of the larger-sized tube, and has an opening hole(8) communicating with the larger-sized hole at a lower portion.

Description

Apparatus for oxygen detection in air}

The present invention relates to an oxygen amount measuring device used in an experiment for measuring the proportion of the volume of oxygen in the air.

Currently, there are experiments to measure the volume of oxygen in the air among the science experimental subjects of the second year of middle school curriculum in Korea. The oxygen measuring device of the air presented in the textbook includes water tank, glass, plank, styrofoam, bottle cap, red phosphorus, Many experimental instruments, such as alcohol lamps, rubber bands, wires, candles, mass cylinders and beakers, must be prepared. Difficult to install or operate the experimental devices. The present invention is to make the experiment easier and more convenient, while devising an experimental device with less experimental error.

Looking at the experimental apparatus and the experimental process introduced in the current second grade textbook of our country, as shown in Figure 1, first put the red phosphorus in the bottle cap and put it on the wooden board in the tank, the top of Cover the glass with the same shape as the cut out of the bottom, and fill the water with a quarter of the height. The bottle cap will float on the water. Next, heat the wire with alcohol lamp to make it red, open the glass cap and carefully light the red phosphorus in the bottle cap, and then quickly close the glass cap. Then, phosphorus rides with white smoke and after a while white smoke melts into the water, and as the oxygen volume decreases, the water rises into the glass species and rises above the surface of the tank. Take the mark and fix it at the position of the first water surface and the surface of the water after the ascension, take out the glass species, turn it upside down, fill the water with two rubber bands, and measure the volume of the water with a measuring cylinder. The difference between the two volumes is then divided by the total volume of water and calculated as a percentage to determine the composition of oxygen in the air. Therefore, in the course of such a complicated and crude experiment, it often causes a lot of experimental errors and calculation errors.

Looking at the main process of the experimental difficulties and experimental errors when experimenting with such a conventional experimental device, it is difficult to erect the glass species in the tank in the process of erecting the glass species first, the bottle cap floating the moon-gun wire on the water In the process of igniting the red phosphorus in the inside, if you try to ignite it, it may fall into the water and pollute the water. In addition, when marking the water level with the rubber band, it is difficult to straighten the rubber band position, which makes it difficult to measure the volume of water accurately. In addition, there have been a few cases where students give up midway because there are not many students who correctly calculate division up to three decimal places.

As described above, the conventional experimental apparatus presented in the current middle school textbook has too many kinds of apparatuses, the process of installing them is complicated, the experimental method is not only crude, and the volume ratio of oxygen in the air is accurately determined from the experimental results. Many students are unable to calculate, and experimental errors are large by division. Theoretically, the volume ratio of oxygen in the air is about 21%. The volume ratio of oxygen obtained by experiments in the textbook is about 10%, and the accuracy of the experiment is very low and in many cases it causes calculation errors.

The experimental apparatus of the present invention has been invented to improve the shortcomings of the conventional experimental apparatus and to make the experimental process easier and simpler. Therefore, the object of the present invention is to 1) simplify the complicated experiment process, 2) reduce the number of kinds of experimental instruments, 3) shorten the experiment time, 4) easily obtain the volume of oxygen in the air, 5) error of the experimental value It is an object of the present invention to provide a new oxygen amount measuring device that can reduce as much as possible.

1 is a schematic diagram of the oxygen measurement test apparatus in the air presented in the current science textbook of the Korean middle school,

2 is a schematic diagram of the oxygen amount measuring device of the present invention.

<Explanation of symbols for main parts of the drawings>

1: large barrel, 2: small barrel,

3: baseline, 4: plug hole,

5: burning spoon, 6: candle stand,

7: rubber stopper, 8: opening.

As shown in Fig. 2, the experimental apparatus of the present invention is composed of acrylic cylinders (1) and (2) having two large and small square pillars, and the large cylinder (1) is divided into 13 equal parts and has a scale indicating 130%. The baseline (3) was made with 3 on the three sides, and the part which is 30% from the bottom was set as 0, and the upper part of the barrel (1) was closed with an acrylic plate and the stopper hole (4) having the same size as the ring gel bottle cap was placed in the middle. The stopper hole (4) was sealed by closing a rubber stopper (7) equipped with a burning spoon (5) and a candle holder (6) to burn red phosphorus, and a small container (2) attached to the side of the barrel (1). ) Has a size of 7/13 of the barrel and the opening 8 is formed so that the bottom part passes through the barrel, and the upper portion is an air oxygen measuring device having an open structure.

The test method is to pour water into a small container (2) to fill the baseline (3), and then ignite the red phosphorus contained in the burning spoon attached to the rubber stopper, and put it in the large container (1) and close it tightly. Phosphorus rides white smoke, and after a while, the surface of the mass is rising. At this time, the scale of the water surface is displayed as a percentage, so if you just read the number, you can know the value immediately. Since the scale is engraved on all three surfaces, students sitting around can check the scale up instantly.

Then, to confirm that the oxygen is lost in the barrel (1), the water for the cake in the barrel (2) is added again so that the water level is the same as the water level in the barrel with the higher water surface, the rubber stopper is opened, and the candle for the cake is lit. You can check the exhaustion of oxygen by looking at whether the fire goes out.

Thus, using the measuring device of the present invention it is possible to easily check the amount of oxygen in the air without the need for complicated calculations.

It will be described below by comparing the results of each experiment with the conventional experimental apparatus and the experimental apparatus of the present invention.

(Example 1)

Experimental example using a conventional experimental apparatus.

Experimental equipment and materials: It consists of 12 kinds of tanks, glass species, rubber bands, bottle caps, styrofoam, planks, beakers, measuring cylinders, wires, alcohol lamps, matches and candles.

Experimental Method: First, fill the tank with half water. Subsequently, weigh 2 grams of red phosphorus, place it in a bottle cap, place it on a plank, and float it on the water in the tank. Then, cover the glass with the board and place it on the pedestal. Next, the rubber band is used to mark the position of the water surface on the surface of the glass species. Turn on the alcohol lamp, turn the wire red, insert it from the top of the glass, light the red phosphorus, remove the wire, and then quickly stop the cap of the glass. Wait until the water level in the glass species no longer rises, pour water so that the surface of the glass species is the same as the surface of the tank, and mark the height of the water surface using the rubber band on the surface of the glass species. Open the stopper of the glass bell and put out a candle to confirm that all the oxygen is consumed. Then, take out the glass bell, close the stopper, pour water to the place indicated by the rubber band, fill it with a measuring cylinder and measure the volume. The volume of air before and after the red phosphorus is burned.

Experimental Results: The results of experiments were divided into several divisions, and the volume ratio of oxygen was about 10%. The time taken for the experiment was about 40 minutes. 1 segment: 12%, 2 segment: 9%, 3 segment: 15%, 4 segment: 13%, 5 segment: 11%, 6 segment: 12%.

(Example 2)

Experimental example using the device of the present invention.

Experimental apparatus and materials: The test apparatus of the present invention, red phosphorus, candles, matches and four kinds.

Test Method: Fill a small container with water and fill it up to the baseline. Then, put red phosphorus in a burning spoon attached to a rubber stopper and put it in a large container. Yin rides on a comedy, and after a while, the surface of a large barrel rises. At this time, the scale of the water surface is displayed as a percentage, so you can know the value immediately by reading the number. In order to confirm that oxygen is lost in the large bucket, add the water again so that the water level in the small bucket is the same as that of the large bucket where the water surface is high, fill it with water, open the rubber stopper, and put the lit candle for the cake. You can check whether or not.

Experimental Results: The results of experiments were divided into several divisions, and the volume ratio of oxygen was about 21%. The time required for the experiment was about 6 minutes.

Hereinafter, Table 1 summarizes the advantages and disadvantages of the existing experimental apparatus and the newly designed apparatus of the present invention.

Table 1

When the oxygen measuring device in the air of the present invention is used, the experiment procedure is simple and the experiment time is reduced, and the accurate experimental results are obtained as well as the types of the experimental instruments are smaller than those of the conventional experimental apparatus. The process of the experiment can be easily observed to increase the interest in the experiment, and post-experimental processing is very easy. In addition, the experimental apparatus of the present invention has the advantage that it is easy to manufacture, low production cost is economical and can be usefully applied to the teacher's learning instruction.

Claims (2)

In the experimental apparatus for measuring the amount of oxygen in the air, one consisting of acrylic cylinders (1) and (2) having two large and small square columnar cylinders, and the large cylinder (1) divided into 13 equal parts 130 Make a scale indicating% and attach it to three sides, and have a reference line (3) with 0 to 30% from the bottom, and the upper part of the barrel (1) is covered with an acrylic plate and the hole of the same size as the ring gel cap 4), and the small container (2) attached to the side of the large container (1) is 7/13 size of the large container, and forms an opening (8) so that the bottom part communicates with the large container, and the upper part has an open structure. Air oxygen measuring device having. The air hole according to claim 1, characterized in that the hole (4) of the barrel (1) is configured to be closed by closing a rubber stopper (7) attached with a combustion spoon (5) and a candle holder (6) for burning red phosphorus. Oxygen amount measuring device.