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Boiling point of liquefied gases with Arduino and PhyPhox
#1
Hi, 

I recently met the PhyPhox app and found it great. 

I am a chemist and have used Arduino microprocessors to make physical and chemical measurements and when I saw the capabilities of the PhyPhox I wanted to make an example. 

The Experiment I designed uses an Arduino to measure the boiling point of liquefied gases with a DS18B20 temperature sensor transmitting data via bluetooth to my cell phone for analysis using PhyPhox.

I leave here the link of the report I made on the Instructable website for your knowledge. 

Measuring the Boiling Point of Liquefied Gases Using Arduino and PhyPhox : 4 Steps (with Pictures) - Instructables

Best regards


Attached Files
.pdf   Measuring-the-Boiling-Point-of-Liquefied-Gases-Usi.pdf (Size: 1.3 MB / Downloads: 130)
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#2
Very interesting! It would be nice to measure not only a single value but pressure dependence of the boiling point. According to https://gas-servei.com/shop/docs/technic...servei.pdf just with a velo pump one can go from -25°C to 0°C for the 1,1-Difluoroethane (R152a) for example. Arduino Nano 33 BLE Sense can be used for pressure measurements.

I am afraid only of this wikipedia warning : "Difluoroethane is an intoxicant and precipitates fatal cardiac arrhythmia...".
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#3
Thank you solid for your comments.
Good your idea of using a velo pump to measure the boiling point at different pressures.
I was thinking of doing it by going to the beach and then going up to the top of a volcano at 3300 m altitude (making several intermediate measurements), a trip that in my country can be done in less than 5 hours but the Covid-19 complicates it.
If I saw the toxicity of difluoroethane on Wikipedia and was surprised because this product is over the counter and its very common use (duster).
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#4
Please note the following disclaimer that I have included in my Instructable:


DISCLAIMER: The gases used in this Instructable were chosen for availability and as a way to exemplify the procedure described, however, in the case of refrigerant gases, the legislation in force in each country related to the release into the atmosphere of substances with ozone depletion potential and recycling procedures should be considered.

If you wish to replicate this procedure, it is recommended to take into account both safety and environmental protection aspects.



The above in relation to a comment I was made regarding the use and disposal of refrigerant gases.

Best Regards

Aewolframio
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