How does an ink pen write ?

Question

please tell me the scientific principle behind the working of an ink pen.

Answer 1

Ink pen has a very fine capillary above the nib which leads to the ink reservoir of the pen.

now when we put ink in pen and put the nib downward the gravity pushes the ink up to the end of the tip of nib.

A paper is a porous material having capacity that it can absorb the ink.When we put the pen on paper that part of paper absorbs the ink.the ink in the nib gets empty.but due to force between the particles of the ink ( called the COHESIVE FORCE) INK in the nib pushes the ink from the ink reservoir of the pen.
as these forces are somewhat weak so gravity helps to bring the ink down.

that is why U cannot write while holding the pen down and keeping the paper up.

as U write the ink in nib keeps coming from the ink reservoir to the nib and keep depositing on the paper.
the dimensions of the nib and capillary are preset by the makers of the pen so that only needful ink come out when U write.

If U hold the pen straight in Ur hand then the ink do not floes bcos the attractive forces between the molecules of the ink and the nib keep holding the ink and prevent it from falling.

U cannot write on smooth surfaces bcos it doesn't contains capillaries to absorb the ink.

Answer 2

Most ink pens (of the ball-point type) carry a liquid 'ink'.

However, the 'ball' makes a pretty snug fit with the tube at the end of the ink channel, so no ink leaks out (under normal conditions).

As you write, you press the tip of the pen against the paper. This pushes the ball slightly backward into the ink cavity, and relieves the friction between the ball and the channel. It also allows the ball to roll, thus bringing fresh ink to the writing surface (the contact between the ball and the page).

Once you're finished, you lift the pen from the page. This removes the upward force on the ball, and the ink pressure behind it forces it down to the end of the channel to complete the 'seal' and prevent further ink from exiting the pen.

The other 'family' of pens would be known as 'quills'. These are pens that literally have to be dipped into a bottle of ink and then used to spread the ink onto the page ... kind of like using a very fine paint brush.

There is one other class of 'ball-point' pens that does NOT use liquid ink. These were developed for NASA, to allow writing where there is no gravity to bring the ink down the channel and onto the page. In this case, the ink is more like a gel than a fluid, and it is the friction of the ball against the gel that 'melts' enough material to coat the ball. The fluidized gel is then rolled around to the writing surface and transferred to the page. There is no leakage, because the gel is stable at normal temperatures.

Answer 3

quite simple physics,you remove the ink from where it was and the ink from inside moves into place.eg.pure a little water on table and then run toothpick or similar size item through the water fast enough to see the water move out of the way yet not to fast that it does not fall back into the path of which you have run the toothpick.The water is acting like the ink in the pen,this why when you run a pen really fast it can sometimes stop.This little exercise will explain alot with trial and error.