Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
Classical Physics
Quantum Physics
Quantum Interpretations
Special and General Relativity
Atomic and Condensed Matter
Nuclear and Particle Physics
Beyond the Standard Model
Cosmology
Astronomy and Astrophysics
Other Physics Topics
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
Classical Physics
Quantum Physics
Quantum Interpretations
Special and General Relativity
Atomic and Condensed Matter
Nuclear and Particle Physics
Beyond the Standard Model
Cosmology
Astronomy and Astrophysics
Other Physics Topics
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Physics
Other Physics Topics
Non-Linear Evaporation: Explained for Beginners
Reply to thread
Message
[QUOTE="Zuchi, post: 6127617, member: 656975"] Hello to you all, Can someone please explain non-linear evaporation to me. I have not studied physics and it was a very long time ago that I learned chemistry and maths at school. So please explain it to someone with no prior knowledge of physics. A small glass tube is filled with the liquid methyl benzoat. The radius along the glass tube appears constant. The glass tube is housed in a plastic case with metal backing, and fixed to a radiator. When turned on the radiator has hot water flowing through it so as to warm up a room in winter. The idea is that the extent of evaporation in the glass tube shows the heat consumption and so used to apportion heating costs to individual users. The hot water feeding the radiator comes from a communal central heating system. Below is a photo of the glass tube, or google Minotherm II: [U][URL='https://www.google.de/search?q=Minotherm%2BII&client=ubuntu&hs=N6v&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiMqKKm85zgAhWCjCwKHfKkDh8Q_AUIDigB&biw=1859&bih=942#imgrc=hzA_s3oxM_XwRM']https://www.google.de/search?q=Minotherm+II&client=ubuntu&hs=N6v&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiMqKKm85zgAhWCjCwKHfKkDh8Q_AUIDigB&biw=1859&bih=942#imgrc=hzA_s3oxM_XwRM[/URL][/U]:It is said that evaporation is non-linear, and differs depending on the liquid level in the glass tube. Q1. What is here meant by non-linear? Q2. What role does the height of the liquid play in the evaporation rate?On the left of the glass tube is a normal millimetre ruler, 7mm above zero, below zero 0-60mm, placed there for comparison. To measure the amount of methyl benzoat that has evaporated in a year, they used a scale that has a unique layout ( the „unique scale“). This is the scale on the right of the glass tube. This unique scale has 7 units above 0, marked by 901, 903, 905 and 907. These equate to 7mm. Below 0 the unique scale diverges from a normal millimetre ruler. The spacing is different and for every 10 units down the glass tube, the bands become increasingly narrower. After 30, each 10 units (30-40, 40-50, 50-60, 60-70, 70-80) are shown by only 5 dashes which seem to be due to limited place for marking. Still, the bands continue to be increasingly narrower from 30 to 80. The unique scale runs up to 80 units whereas the millimetre ruler runs up to 60 mm. The effect of the unique scale is that lower down the glass tube, a smaller amount of liquid evaporated will reach the next dash / the next unit / the next consumed unit used for calculating heating costs.Q3. Is the unique scale an adjustment to neutralize non-linear evaporation? Phrased differently - When the same amount of heat flows through the radiator, leading to units of methyl benzoat in the glass tube being evaporated (the consumed units), is the unique scale used to counter non-linear evaporation? Is it used to neutralize possible influence from the height of the liquid in the glass tube (be it at 4, 34 or 44) in the evaporation? Q4. If not, what is the use of such unique scale?I am grateful for your clarifications. Thank you in advance. Zuchi [/QUOTE]
Insert quotes…
Post reply
Forums
Physics
Other Physics Topics
Non-Linear Evaporation: Explained for Beginners
Back
Top