True Altitude 

This guy is great. His funny descriptions are exactly what’s going around in my head when I’m looking at these instruments.😂

After reading my instruction manual 4 or 5 times and scratching my head, I found your video and the light came on. Not only did I understand what I was looking for which was how and why temperature and pressure affect the altimeter, but I accidentally came to clearly understand the reasoning and effect of setting the altimeter to 29.92 above 18,000 feet. Thank you.

As always, love the videos, they’ve certainly helped me with my IFR training. Not just getting an answer correct, but understanding WHY the answer is correct is so much more important for long term memory.

The only video that set my mind right on this. Thank you very much for making this video!

Thank you so much for this! You've made it so clear. Now I do it this way ! I'm still learning more but thanks for your explanation!

This is a great video! This concept makes a lot more sense now after having it explained this way. Thanks!

Great explanation!!! This helps me tremendously with a concept I struggle to remember.

You're a genius. I just understand it with the lateral pressure and temp. changes.

Hey man this is great this makes so much more sense, Thank you!!

Excellent explanation, being a low time VFR pilot its a challenge to retain all the information necessary to feel and be safe, This will certainly help me.. Thanks for the post.

Thank you for explaining this difficult subject in a way easy to understand .

Best videos for a refresher on RU-vid.

Great Explanation. Relate-ability is key!

Your idea is awsome, new way of learning

This video is wonderful. Thank you very much.

OMG you are a genius! I was so confused on the "low to high clear blah blah" stuff that it seemed I'd never get it. This is such a logical explanation, thanks a million!

You’re the best, blessings to you

Best video about this subject !! Loving the comparison with our body which will finally make me remember it forever

Great way of explaining it!

Such a good explanation!

very good, studying for the EASA ATPL 15yr pilot and had a brain fart, this was great to get me back on track, you never stop learning in this game. you sound like click and clack!

You're a good teacher.

Very helpful. Non of my instructors have successfully presented this concept.

Thank you for great videos. If you can bump up your volume a bit so we can hear well. Thank you.

The best way to find true altitude is with a measuring tape. What to do when flying ?.In practice approx pressure estimates are used in the sub scale of the altimeter. The altimeter reads the height above that setting . When using flight levels above 18000 feet in USA or 10000 feet in Australia, the same pressure setting is always used, 1013 mb or 29.92 in/Hg in the sub scale of the altimeter. .No matter what the real pressure, aircraft will all clear mountains when using flight levels.

Very helpful. Thank you!

That's a beautiful tip, thanks!

Make more videos on different types of altitude please!

Great Video. Thanks

good job! very helpful

Brilliant! Thanks

lovely explanation thanks

what I don't understand when we fly from hot to cold WX as I know we fly from low pressure to high pressure , when I read in Jeppesen it said that when we fly from hot to cold its that we fly from high pressure to low pressure . what I know is that cold weather has more dense which is more pressure than hot weather ?!

I got the hot to cold and high to low, i just didn't understand why the indicated altitude increased as you increased the setting in the kollsman window, thanks for clarifying.

Given: Aircraft at FL150 overheard an airport. Elevation of airport 720 FT. QNH 1003 hPa, OAT at FL 150 is -5 degrees Celsius. What is the true altitude of the aircraft (Assume 1hPa = 27FT)

Great explanation.. and maybe I'm thinking about it too much. But if field elevation is 650 feet above sea level, and pressure drops with altitude, wouldn't the field pressure be lower than 29.92 and not higher (30.57)? Or should I just assume there is a high pressure weather system rolling through, or it's a hot day? It may seem like a smart-ass question, but I'm really just trying to wrap my brain around it! Thanks!

perfect explanation

fantastic video!!!!!!

Thank you GLN !!

EXCELLENT!!!

I struggled with understanding the physics behind the temperature one too. Here's what I came to: Cold air is heavier, denser, and slower moving, so it all sinks to the ground and drops off very quickly as you rise. Hot air is lighter with more energy, so it is able to climb higher and spread out more. So the difference in pressure between 100 feet of hot air is covered in say 90 feet of cold air. So in this example, when your altimeter says 1000 agl, you're really at 900. (Actually I doubt it would be linear like that, I'm pretty curious if anyone knows)

wow this is really smart analogy

why is the audio so low?

why do small planes deep-in-free-fall when they travel from high Plato to a low-land/gorge area ?? Why doesn't it fly over it without that pain ? Anyone, please explain . .

Really confiusing at all

Best explanation ever, really thanks A LOT

wow thx so much dude i was watching this video when i came across the same question you pointed out in example 2 lol xD.

Beware at 4:15...he mistakenly says standard pressure is 27.92 In-Hg ....the correct Standard Pressure value is 29.92 In-Hg. He may have just been going too fast.

I thought low pressure was warm air and high pressure was cold air. So why would it not be you thought u were lower in altitude when you go to low pressure area?

I always enjoy your videos but I had to write to say this one had me laughing about the high to low guessing part.

This is gold

I like it!

Excellent explanation!!

I see this video was posted 8 years ago, and you answered a question just one month ago. That is awesome! Your video is excellent, as is your teaching style. Very well done!

Hello, please help me to solve step by step the exercise: "Pressure altitude 10000 ft, Temp -30 C. What is the True Altitude?". Am not interested in a solution like: "Ok, on your Pathfinder computer put the PA and the Temp and ask for the result". I work with a Jeppesen Techstar but it asks to put the Corrected Altitude in order to give me the True Altitude. What to do in order to find the CA?

Sir do we have to keep adjusting our altimeter setting along flying into an area of low/high pressure in order to maintain our true alititude or there is another method to do so our indication would be true ? Because as explaned above on the video a long you are flying into an area of cold weather the pressure decreases gradually and the altimeter reads higher (obvious) , how can we make the altimter indicates true altitude along flying into an area of hot/cold weather ? Thank you sir for your efforts

excellent thanks

Great

Thankyou!

Great video - thank you!! The only thing that was not clear to me without additional research was that in the US altimeters are set to Standard Datum Pressure (29.92'' Hg) when they reach FL18 and thereafter (therealoft? :) ). Above that they fly at assigned PRESSURE ALTITUDES and not TRUE ALTITUDES (altitude above MSL). If this is true, that would be necessary to know to solve the last problem in your video. Without it, I did not have an initial point of reference and could not figure it out without advancing the video. You did eventually mention that "an airplane flying @ FL29 would have an altimeter setting of 29.92. It also flies at PRESSURE ALTITUDE." That cleared things up for this particular problem, but did not provide the explanation why it was set to 29.92. For a beginner such as myself, that would have been useful information. I hope you don't take my comment as criticism but rather as feedback, because, as other people have stated before me, your video does clear things up a lot. So thanks again, and fly safe!

thks!!!!

Da se visinomjer namjesti na 0=15 C stupnjeva kao pocetna temperatura? 0 je prava visina=15 C stupnjeva je pocetna temperatura? Svakih 333,3 metara temperatura pada za 1 C stupanj? 😀

Please somebody help me understand. It is supposed that the colder air is more dense. Should not the altimeter read lower when flying into lower temperature, since the air is colder, therefore denser? I don't understand

I set my altimeter to 0 .. I fly from. “sea level “..I’m a low lander! ;)

Awsome

8:28 where did he get those extra 500 feet from?

A very great way to teach it!!!!!

Genius

5:15 Bingo! Thank you!!!

Please...there is a science to all of this. Please think about this... Altimeters measure air density, they are NOT made to measure temperatures. Air is more dense near the ground and become less with higher altitudes. Right? 1. Cold air is MORE dense than hot air....that also means that warm air is LESS dense than cold air. 2. Dry air is MORE dense than hot air...that also means that humid air is LESS dense than cold air. Try to take off on a hot and humid day. The heat does not mean your closer to the ground, it means the air is less dense and you have a high density altitude. Really! If you are measuring air density (altimeter) and increase the density, the altimeter will register a lower altitude. Why? The air is more dense. The saying is true when you fly from a high to low PRESSURE areas. BUT flying from a warm (less dense) into cold air (more dense) DOES NOT MAKE THE ALTIMETER RISE! That is wrong! If you don't believe me, put the numbers in a E6B and try it out. You'll see that higher temperatures make for higher density altitudes. Likewise, cold air does not make the altimeter rise. Cold and dry air makes for the lowest density altitude.

Good video but volume is super low

Wish I had this explanation first.

What would happen to the TRUE ALTITUDE if we flew into an area of cold weather ? Would it increase or remain the same ?

please fix the audio, i can barely hear it

Altié-Meter is lyké a Barrow-Metré

isnt it dangerous not to know the true altitude? isn't it risky to have to do these calculations in flight? why don't they have an instrument that simply measures the barometric pressure surrounding the airplane as it changes and keeps changing? This video definitely explains but why all of this in the first place??

Can't hear it. Volume is too low. I'm not even deaf.

That all makes sense until you consider density altitude where a higher temperature results in the airplane thinking that it is at a higher altitude. In that case wouldn't going from cold to hot make you tend to fly the plane lower and so you would again need to look out below?

I feel like an idiot I can’t understand this

So simple to memorise it now... This shit "from high to low, watch below" makes no sense to me

From 1928 so sad technology hasn’t moved with the Altimeter we are living in the donkey ages

Given: Aircraft at FL150 overheard an airport. Elevation of airport 720 FT. QNB 1003 hPa, OAT at FL 150 is -5 degrees Celsius. What is the true altitude of the aircraft (Assume 1hPa = 27FT)