Alcohol by Volume Explained

Рет қаралды 3,590

2 жыл бұрын

If you buy a beer that is 5% ABV that does NOT mean there are 5 mL of ethanol to ever 95 mL of water. In this video we look at why that is the case and how we convert Alcohol By Volume to a mass and mole fraction. I also think I've spotted some mistakes in Perry's Chemical Engineers' Handbook, if I am to be so bold...!
00:00 I hate volume
00:35 Mixing water and ethanol demo
02:05 Volume fraction vs volume concentration
03:28 Excess molar volume
05:10 The calculation sheet for ABV
07:22 Plotting excess molar volume
08:30 Mental masturbation
Link to ABV calculation sheet:
docs.google.com/spreadsheets/d/1kJZ6_nsnud1m-lNsAYSqJFq7JmNFGvInUSCFvDwXdj0/edit?usp=sharing
Wikipedia ethanol data page:
en.wikipedia.org/wiki/Ethanol_(data_page)#Properties_of_aqueous_ethanol_solutions
Dortmund Data Bank excess volume for water/ethanol:
www.ddbst.com/en/EED/VE/VE0%20Ethanol%3BWater.php
Density data from Perry's:
Perry's Chemical Engineers' Handbook, 8th edition. 2008. New York : McGraw-Hill. Table 2-112, pp. 2-117.
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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...”
This channel is not only for chemical engineers - anyone who works with processes should be able to find something of value here.
#AlcoholCalculation
#ABV
#AlchoholByVolume

Пікірлер: 11

@MrVipulLal 4 ай бұрын

Very clear explanation. Thanks!

@omi1468 11 ай бұрын

I'm a Mechanical engineer. Deal with materials to be used according to applications. I kept wondering for quite few months that, "Why all test results by mills measure the alloying content by weight% always and never by volume%?" Today I got the complete satisfactory answer to my doubt. All of this is really very interesting, because people like you make it so. Thank you, sir🙏

@leocurious9919 11 ай бұрын

Just measuring the volume of liquids and gasses is already harder than mass, that alone is enough reason to use mass. But for solids it is really hard to measure volume, so using it there is crazy. And if you do, then you get a lot of different numbers for different contexts: With or without the voids in-between the solid (pure density, bulk density) and also with the pore volume for different pore sizes (solids almost always contain pores inside the individual particles).

@robertbradfield8656 2 жыл бұрын

That was lovely 🙌

@panoskb9405 2 жыл бұрын

Very nice video as always!!?

@ItatiaiaBR 2 жыл бұрын

Nice video.

@eronpaulo23 2 жыл бұрын

Great!

@muhammadaliejaz2 2 жыл бұрын

You are very good

@ProcesswithPat 2 жыл бұрын

I’m just stubborn!

@rpgenious 10 ай бұрын

Okay so as you showed, the excess volume increases (the negative decreases) as you increase the temperature. Could it be that it turn to positive excess at a certain temperature? I wouldn't be surprised. We all know alcohol has an azeotropic point at around 94%. Why is that? It's because the mixture has a lower boiling point that of the pure alcohol. Lower boiling point means higher vapor pressure. So a 94% alcohol-water solution has a higher (!) vapor pressure than the sum of the pure substances. That is a positive excess property.