1). Dimension And Unit
Fundamental Constant
|
Quantity |
Value |
Units |
|
Gravity acceleration g |
9.8 |
m/s2 |
|
32.17 |
Ft/sec2 |
|
|
Density of water r |
1000 |
Kg/m^3 |
|
1 standard atmospheric pressure |
1.013x 105 |
N/m^2 |
|
10.3 |
M ( water column) |
|
|
33.9 |
M (water column) |
|
|
76 |
Cm (mercury) |
|
|
Specific weight of water g |
9800 |
N/m^3 |
Example of atmospheric pressure in a water column with bottom opening to the are:
r .g. H = patm. A
H = patm /( r .g). = 1.03 x105 [ N/m2]/ (9800) [N/m3]
=~ 10 [m] water column.
Fundamental conversion factors:
|
Multiply by |
To obtain |
|
|
m |
3.28 |
ft |
|
mph |
1.61 |
Km/hr |
|
Pa |
1 |
N/m^2 |
|
J (joule) |
1 |
N.M |
|
W (watt) |
1 |
(N.M)/S = J/S |
|
HP (horsepower) |
745.7 |
watt |