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- Information is available on:
-
- The Main Menu
- General
- Gases
- ________________________________________
-
- Note that if any read me files are
- supplied as part of this application,
- they may have more recent information
- than is contained in this file.
-
- UnitConv is © Chris Johnson, 1992
- ________________________________________
-
- This application provides interactive
- help when the !Help application is
- active.
-
- There are also other help displays with
- appropriate information available from
- all other menus associated with this
- application.
- ________________________________________
-
- General
-
- Simply enter the value you wish to
- convert FROM into the appropriate
- writable icon. The corresponding value
- in all of the other units will be
- continuously updated and displayed. A
- particular value can be cleared using
- Ctrl U (hold down ctrl and press U).
- Clicking MENU within the convert window
- leads to a choice of various classes of
- unit to convert, e.g. speed, length. See
- below
- ________________________________________
-
- The Main Menu
-
- The following options are available:
-
- Energy
- Pressure
- Length
- Mass
- Volume
- Speed
- Temperature
- Gases
- Help - opens this help window
- ________________________________________
-
- Gases
- Clicking on this option opens an
- additional dialogue box. You may enter
- values for the temperature of the gas,
- the pressure of the gas, the size of the
- molecule, and the relative molar mass
- into the appropriate icons and then
- click on Calculate. Pressing <RETURN> is
- the same as clicking Calculate.
-
- If you have entered values for all four
- parameters, then the following values
- will be calculated.
-
- Mean free path of the molecules.
-
- RMS, average and most probable
- velocities.
-
- Collision frequency and the total
- number of collisions in a cubic metre.
-
- The program tries to be intelligent
- about what to calculate. For example,
- the velocities require only the
- temperature and the molar mass, whereas
- the mean free path calculation requires
- temperature, pressure and size of
- molecule. The program calculates what it
- can, and leaves the data fields blank if
- there is insufficient input data for
- that calculation.
-
- Clicking MENU in this window allows you
- to change the default units used for
- pressure (atmosphere, N/m² and torr) and
- size (pm, nm and m), and to enter the
- size either as the diameter or cross
- sectional area. If you choose to enter
- the size as a diameter, the program
- assumes the molecule is spherical.
-
- Remember - we are dealing with the
- COLLISION cross-section. This is
- effectively PI x diameter², since the
- distance between centres of colliding
- molecules is 2 x radius.
-
- Temperature is always entered as kelvin.
-
- The window remains on-screen until
- explicitly closed.
- ________________________________________
-
- Acknowledgement
- This program was compiled using the ABC
- BASIC compiler (Oak Solutions).
- ________________________________________
-