REFERENCE MANUAL

Units and Concepts


Units abbreviations
        In the next table the units abbreviations as used in this reader are given.

m
metre  
p (pico)
10-12
s
second  
n (nano)
10-9
h
hour  
µ (micro)
10-6
W
Watt  
m (milli)
10-3
HP
horsepower  
k (kilo)
103
J
Joule  
M (mega)
106
cal
calorie  
G (giga)
109
toe
tonnes of oil equivalent  
T (tera)
1012
Hz
Hertz (cycles per second)  
P (peta)
1015


Wind speeds units
        The following units are used to measure wind speeds:
1 m/s = 3.6 km/h = 2.187 mph = 1.944 knots
1 knot = 1 nautical mile per hour = 0.5144 m/s = 1.852 km/h = 1.125 mph



Wind speeds scale
        In the next table the wind speed scales are given:

Wind speed at 10 m height
Beaufort scale
Wind
m/s
knots
0.0-0.4
0.0-0.9
0
Calm
0.4-1.8
0.9-3.5
1
Light
1.8-3.6
3.5-7.0
2
3.6-5.8
7-11
3
5.8-8.5
11-17
4
Moderate
8.5-11
17-22
5
Fresh
11-14
22-28
6
Strong
14-17
28-34
7
17-21
34-41
8
Gale
21-25
41-48
9
25-29
48-56
10
Strong Gale
29-34
56-65
11
>34
>65
12
Hurricane