Question-30866

Question Number 30866 by Tinkutara last updated on 27/Feb/18

Commented by Tinkutara last updated on 28/Feb/18

Is this the same reason for two times surface tension in Q 30094 also?

Commented by mrW2 last updated on 28/Feb/18

T h e w a t e r c o l u m n h a s o n b o t h e n d s

c o n t a c t t o a i r . W e h a v e 2 t i m e s s u r f a c e

t e n s i o n t o h o l d t h e w a t e r c o l u m n .

Commented by mrW2 last updated on 28/Feb/18

14 m m ?

Commented by Tinkutara last updated on 28/Feb/18

Answer is 15 mm. Maybe you took g differently.

Commented by mrW2 last updated on 28/Feb/18

2 \times \frac{2 \times 73.5 \times 10^{- 3}}{1000 \times 9.81 \times 0.002} = 0.015 m = 15 m m

Commented by Tinkutara last updated on 28/Feb/18

Y e s t h i s g i v e s 15 m m b u t f o r m u l a i s

h = \frac{2 S \cos θ}{r ρ g} . I {c a n}^{'} t u n d e r s t a n d w h e n

w e t a k e i t \frac{4 S \cos θ}{r ρ g} .

Commented by mrW2 last updated on 28/Feb/18

N o . T h a t i s a d i f f e r e n t s i t u a t i o n .

Commented by Tinkutara last updated on 01/Mar/18

Thanks! Got this question.