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prajith

· started a discussion

· 1 Months ago

please anwer (Question: 197412.0 )

We can't use ball pen in space , i.e gravitational force is essential for ball point pen

Question:
Ball pen functions on the principle of -
Options:
A) Viscosity
B) Boyle's law
C) Gravitational force
D) Surface tension
Solution:
Ans: (d) Ball pen function is based on the principle of Surface tension. Surface tension is the elastic tendency of a fluid surface which makes it acquire the least surface area possible.

Knowledge Expert

· commented

· 1 Months ago

Ball pen is also known as biro, ball pen or dot pen, uses a metal ball made up of steel, brass or tungsten carbide for the dispersion of the ink where you write. Ball pen is developed as the cleaner and more reliable alternative to the fountain pen, quill. There is narrow clearance between ball and socket of the pen so that when the ball is rolled across the paper it spreads a thin film of the sticky ink and gets deposited on the pressurized point on the paper due to gravity. Due to adhesive force between ball and ink, ink gets stick to the surface of ball pen and when the ball of pen is rolled then the ink will enter through that narrow clearance due to gravity to the pressurized point on paper since the adhesive force between ink with paper is high than with ball. In above question the best answer will be surface tension and gravity (not gravitational force).
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