Acoustic pipe inside loading detection reagents, such as carbon dioxide, acoustic pipe inside the white part, oxygen acoustic pipe inside the black part. When the detected gas is contacted with a reagent. Occur chemical reaction, caused by the color change. That is to say, once it has been detected in the gas through the acoustic tube, color change indicates the presence of gas as well as its concentration. Can be used for further explanation:

Episodes of color change was the real reason for acoustic pipe inside the detecting reagent in contact with the gas, episodes of chemical reaction, resulting in the formation of a different material.

For example, when carbon dioxide acoustic pipe inside the white reagent into contact with carbon dioxide gas, change to generate another purple material. When oxygen acoustic pipe inside the black reagent in contact with oxygen, change to generate a white substance.

Of course, there will be some gas acoustic pipe and more different, there are some differences change process.

2, why the thermochromic layer length can be said to the concentration of the gas?

First of all, the acoustic pipe equipped with detection reagent ( also is to the above questions explanation: acoustic pipe represent the color change)

Let us have oxygen acoustic pipe as an example, the acoustic tube tightly filled with detection reagent, detection, air is sucked into the acoustic pipe gas collector. The oxygen in the air molecules and detection reagents in response to the reagent from black to white.

With the advance of time, oxygen molecules into the detection agent and detection agent contact gap, and increasingly deepening of acoustic pipe. This process continued to advance, a layer to advance, until no oxygen into the suspension, color change.

Importantly, different concentration means were abstracted from the oxygen in the air quantity is different, when a large amount of oxygen ( high concentration ) oxygen molecules will walk away ( white region very long ). But when only a little oxygen ( low concentration ), will be very fast through the reagent and the reaction and exhausted, so white area is very short.

Therefore, the acoustic pipe thermochromic layer length and gas concentration is proportional to the length of observation, discoloration and can detect gas concentration in the air of.

3, in the use of oxygen acoustic pipe detection, why the fever?

Hypothesis is the winter you used to warm warm bag, in the open bag after shaking, you'll find out its sudden warming. This is because the inside of the iron element material function, oxygen molecules are adsorbed into the iron element particle clearance, and generate heat.

Oxygen acoustic pipe in ti. When oxygen molecules with titanium particles contact adsorption, in the color at the same time, also can release heat (as in the above mentioned thermal bag. ).