In chemistry, a pen is not used to draw lines on chromatography paper. A pencil is used to draw lines on the paper because the ink can smear and interfere with the chromatography and the ink will dissolve in the chromatography solvent.
because it is neater and if you make a mistake you can rub it out.
The element used in most ball point pens is osmium, which is a rare naturally occurring element. It is usually alloyed with platinum.
because the dye in ball pen ink will rise with the solvent system.
Pen ink is poisonous but not lethal. It's okay if you accidentally draw on your tongue, but it is not advisable to drink it in replacement to water.
Two uses for Osmium: >> With Iridium, an alloy used in making precision ball bearings & ball point pen points. >> As a catalyst in the synthesis of Ammonia (NH3) and in the hydrogenation or organic compounds.
Iridium and osmium are the elements that are used to harden pen points. Iridium is used in an alloy with osmium.
because if the ball pen used in the paper chromatography its possible that the ink of the ball pen was mixed in the food colors.
if you mess up you can erase it
because it can be rubbed out you nogging
35 miles....
Ball & Roller Bearings both belongs to the category of radial contact bearings.In case of ball bearings spherical balls are used however in case of roller bearings cylindrical rollers are used.due to balls used in ball bearings there is a point contact is made whether it is line contact in roller.
take a pen and use dc->LineTo(point).
get a pen or pencil, then put it on whatever your gonna draw the hose on, then do a line, then do another line parrel to it, then do a line at each end of those lines, so they are conecting, there is your hose |=========|
You will get a chromatograph of the dyes in the pen's ink, instead of a reference mark.
you don't
roller ball pens employ a mobile ball and liquid ink to produce a smoother line.
Mouse or light pen
You can draw a pen many different ways, be creative.