Question

How high a column of air would be necessary to cause the barometer to read 76cm of hg?

Answer 1

Explanation:

Explanation:

The pressure is

p

=

ρ

g

h

The density is

ρ

k

g

m

−

3

The height is

h

m

and

g

=

9.8

m

s

−

2

Height of the column of air is

h

a

i

r

Height of the column of mercury is

h

H

g

Therefore,

ρ

a

i

r

g

h

a

i

r

=

ρ

H

g

g

h

H

g

h

a

i

r

=

ρ

H

g

h

H

g

ρ

a

i

r

=

13.6

⋅

10

3

⋅

0.76

1.2

=

8613

m

Answer 2

Answer:

p

=

ρ

g

h

The density is

ρ

k

g

m

−

3

The height is

h

m

and

g

=

9.8

m

s

−

2

Height of the column of air is

h

a

i

r

Height of the column of mercury is

h

H

g

Therefore,

ρ

a

i

r

g

h

a

i

r

=

ρ

H

g

g

h

H

g

h

a

i

r

=

ρ

H

g

h

H

g

ρ

a

i

r

=

13.6

⋅

10

3

⋅

0.76

1.2

=

8613

m.

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