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64         APPLICATION OF THE LAWS OF  HYDRAULICS

Let "y = the initial velocity of the fluid in motion;
Am=the specific weight of the fluid in motion;
Ai = ihe specific weight of the fluid at rest.

The weight of each unit of volume of the fluid in motion is less
than A*. The upward force which acts upon each unit volume of
the fluid in motion is, therefore, equal to A* — Aw. The upward
acceleration due to this force is

^//////////A

FIG. 43.

The depth to which the jet will descend for this case is
ry   v2 sin2 5       Am

For hot gases

from

2g
A°

Am =

A°

Ao

H=-

2

sn

2g

Ao         Ac

l+at,

2g

1+att    l+atm

R_v2 sin2 B    a+ti =v2 sin2 d   273+t,
2g        tm-ti        2g     X tm-tf

For vertical jets, when 5 = 90°, this formula becomes

H^X~l^k

(F)