Does Altitude Affect Pressure Gauge Readings?

Рет қаралды 3,011

2 жыл бұрын

Pressure gauges measure pressure relative to atmospheric pressure... So what happens when you move a gauge to a different altitude with a different atmospheric pressure?
00:00 Going on holiday
01:22 Mean sea level pressure
02:30 Bourdon gauges
07:52 Vacuum gauges
14:13 Conclusion
Process with Pat is the place to come for perspective and to ask stupid questions. I want you to leave more knowledgeable, confident, motivated, and most importantly, curious. I also want to invigorate a field that seems tired and uninspiring, at least if you get your perspective from internet forums. These are not lectures. This is a place for you to leave thinking “Oh! That’s why...”
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Пікірлер: 20

@ChemEngWeekly 2 жыл бұрын

It is a shame the bourdon gauge experiment didn’t work, but the observations of both sets was really interesting! Great job on the video once again Pat👍

@ProcesswithPat 2 жыл бұрын

Thanks! But only a part of it didn't go as planned. Still, no result is still a result, right? Wasn't going to withhold the results!

@carultch Жыл бұрын

A way I would recommend doing this experiment: Rather than connecting to an end-cap, connect to an open valve with the proper plumber's tape to seal the threaded fitting. Let in the 1 atm of pressure at sea level, and close the valve before transporting it to high elevation. This way, you can seal your sample without increasing the pressure.

@sarahbradfield1267 2 жыл бұрын

Really interesting Pat - I'd never noticed the reported air pressure in Jo'burg before.

@robynmays3581 2 жыл бұрын

Loved this one, Pat!

@user-sm2sr6jf4h 8 ай бұрын

very good 👍

@xse345 2 жыл бұрын

Interesting. Take care while travelling.

@ProcesswithPat 2 жыл бұрын

Thanks AJ!

@affanbhaijaan65 2 жыл бұрын

Great content..... What south Africa😳, be safe from omicron varient 😅

@ProcesswithPat 2 жыл бұрын

Great timing for holiday, huh?

@alzenodoe5765 2 жыл бұрын

Can u please make a video explaining "Glashier's law" in case of relating "dew point temperature, wet bulb temperature and dry bulb temperature and ambient temperature". I mean, (T1-T)=G(T1-T2) , where G is Glashier's constant.

@ProcesswithPat 2 жыл бұрын

Hey there! So I had never hear of Glashier's law, and all I can find is the Wiki page for the meteorologist James Glaisher, whom I presume you're reffering to? I can however look into deriving the relationships if you explain what you need...

@alzenodoe5765 2 жыл бұрын

@@ProcesswithPat Exactly, that's James Glashier's law ! It would be good if could send u the text regarding the law , but wait I'm giving u the link , ... pardon me for late reply.

@ProcesswithPat 2 жыл бұрын

Let me know about the link…

@carultch Жыл бұрын

@@alzenodoe5765 I think that is a linear approximation. The relationship among these variables is extremely non-linear, and is based on the Antoine equation for the temperature vs pressure equation of water's boiling point. This is why you either use the chart, or a program with the functions built-in (as I do with EES), rather than calculating the formulas by hand. I just explored this, given the case of 100kPa and 50% relative humidity. I'm assuming T1 = dew point, T2 = wet bulb, and T = dry bulb in your formula. If that's the case, the value of G was nowhere near constant, when I swept T from 0C to 40C

@JLPaper7 2 жыл бұрын

Hi pat. I've a question. Suction is always negative? Why don't we have negative pressure in the suction of a pump?

@ProcesswithPat 2 жыл бұрын

Hey Jorge. I actually thought you made this comment but n my “What happens when you increase pump suction pressure video”. There I show you an example of a pump whose suction pressure is in fact negative (I.e vacuum/pressure less than atmospheric). But pumps can have both positive and negative suction pressures depending on what is upstream of them. If a pump draws from a vessel under pressure then the pressure will be positive. If a pump draws from an atmospheric tank with a low level, and that pump has a long suction line, then the dP in that line can cause the suction pressure to drop below atmospheric (negative gauge). Both are possible.

@JLPaper7 2 жыл бұрын

@@ProcesswithPat Hi Pat, I've just start following you. I will look into that video. So here why my question, Could we have a blower "sucking" from a recipient that it's at 10kpa and in the vacuum line we will have suction but as the Blower it's just making a vacuum pressure of 4 kpa we will be reading in the manometer 6kpa. But the blower will be working fine as it is making the depressure. Also, this blower has a filter in the vacum line. How will the diferrential presure of this filters work when it gets dirty in the reading of the vacum line manometer? I'will have less "vacuum"? Thank you for your channel. I'm looking at all the videos, they are pretty interesting and fun. Keep the hard work mate.

@ProcesswithPat 2 жыл бұрын

I’m not sure I understand your question man… wanna try rephrase?

@bipl8989 11 ай бұрын

If you convert it to absolute pressure there is never negative pressure. Nothing ever sucks, higher absolute pressure on the other side always pushes out.