How does the ink come out of pens?

Answer 1

it is all due to followin reasons........
gravity
the nib has a small oriffice than wher the ink get stored in the mid of the pen in dia
&atlast the ink has a oily product emasculated with ink to have a free flow wit out any ostacles

Answer 2

Well, first of all we should look a little bit on the tip of the pen: it has a deep bifurcation which goes from the very edge of the tip, to a further zone in the back of the "working piece" of the pen. In this space (in about tens or even hundreds of a millimeter) is formed the capillarity effect and that's the same which happens to the liquid in the thermometer, in plants' roots, in very thin blood vessels (therefore they are called like that-capillar-) etc.
It will help you understand this phenomenon better, by making an experiment: try with a transparent straw (preferably glass made) with it's channel no thicker than 1 millimeter , and after this you should keep it in straight position with one of its tip in a glass of water. You will see than that the level of the water in the channel, is risen above the water level from the glass. The amount of height is direct dependent on the liquid viscosity, its surface tension, capillary diameter.
In the same way the ink from your pen has some of this parameters mostly appropriate to those of water itself, and behaves like it. But because in the ink reservoir is no pressure pump or ventilator (to permit some air to be let inside on other way than the tip of the pen, once some quantity of ink is used) , writing upside-down makes this impossible because of the laws of fluid dynamics, and (like someone said-because of the gravity also). Although it should be possible if there would be made some device (aerator, ventilator like) to permit ink to flow with no restrictions.
In real practice these devices are not installed on any of the pens in use because of self leaking of the pen (even so there are a lot of people who had some trouble with the old fountain-pens).
Hope this answer helped you a little bit
Dfriend :)

Answer 3

I would say not only gravity, but also what's called capillary action.

Some fluids can actually go uphill, or up a tube. This is because certain fluids have whats called surface tension. Surface tension allows drops to form. It also allows fluids to actually 'cling' to a small enough tube under the right conditions and climb upwards because of the spring-like nature of surface tension.

Answer 4

gravity. try writing upside down