I need help. I am trying to model pressure vs. melting points for the metals in
ID: 2088487 • Letter: I
Question
I need help. I am trying to model pressure vs. melting points for the metals in the picture below. I only have 4 data points and, when graphing it in Excel, is not good enough to generate a good enough model. As you can tell. it is not linear. it is of the 2nd order, and the wide jump from 10-4 Torres to 760 makes it really impossible to predict values of temperature eith pressure.
I need to make a model to predict the temperature required to evaporate these metal substances at a pressure of 7.1x 10^2 torrents. as that is as high as the vacuum pump we have is capable of going.
I can't find any tables online to show melting/evaporating points of these metals st other vacuum pressures.
What are the melting/evaporating temperatures of these metals st 10^-n pressure. with n being any integer greater than 8?
What table did you use? How do I find the table with these values?
! Font Alignment Clipboard Chromium Tungsten Oxide Pressure Melting Point Pressure Melting Point Torr) Temperature (C) 760 Torr) Temperature (C) 1857 1157 997 837 1473 0.0001 1E-06 1E-08 0.0001 980 0.000001 1E-08 Titanium Nickel Pressure Melting Point Pressure Melting Point (Torr) Temperature (C) Torr) Temperature (C) 760 0.0001 0.000001 1E-08 1660 1453 1235 1067 760 0.0001 1E-06 1E-08 1453 1262 1072 927 Iron Aluminum Pressure Melting Point Pressure Melting Point (Torr) Temperature (C Torr) Temperature (C) 760 0.0001 1535 1180 998 858 760 0.0001 1E-06 1E-08 680 1262 1072 927 0.000001 1E-08 0 Tungsten Oxide Sheet1 Ready ?? ] @???Explanation / Answer
http://www.rsc.org/periodic-table/
You can go through above mentioned link of peridic table and just click on element (like chromium, Nickel, Titanium etc...).
It will open whole detail of your specified elemenent, in these detail just go to the "Pressure and temperature data - advance".
Here you will find vapor pressure table, of course pressure is in Pa unit so you will have to convert it to torr. (1Pa = 0.0075 torr)
Temperature is in Kelvin so convert it to Celcius.