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FATTORI DI CONVERSIONE E TABELLE
°F -32
Temperatura: °C=
; °F= (1,8 x °C) + 32
1,8
Misura pressione: mm = 0,03937 in in = 25,4 mm
cm = 0,3937 in
in = 2,54 cm
m = 39,37 in
in = 2,54x10
f
forza
p=
= pressione =
m
2
superficie
Secondo il sistema internazionale la misura di pressione si
esprime in Pascal.
1 Pa=1N/m
2
=1 Newton/metro quadrato.
Le unità ingegneristiche più note per la misura di pressione
sono:
Pascal = Pa (N/m
2
), kPa = 10
3
Pa, MPa = 10
bar
= bar, mbar = bar x 10
-3
metri di colonna d'acqua a 4°C = mH
O, mmH
2
millimetri di colonna di mercurio a 0°C = mmHg, Torr
atmosfera teorica
= at (kp/cm
atmosfera fisica
= atm
pollice di colonna d'acqua a 4°C
= inc H
pollice di colonna di mercurio a 0°C
= inc Hg
micro di colonna di mercurio a 0°C
= µm Hg
pound per square inch
= psi
PA
kPa
MPa
2
N / m
-3
-6
1
10
10
3
-3
10
1
10
6
3
10
10
1
5
10
100
0.1
-4
100
0,1
10
-3
9807
9.807
9.807 - 10
9.807
3
-6
9.807 - 10
9.807 - 10
-6
133.32
0.13332
133.32 - 10
3
-3
98.07 - 10
98.07
98.07 - 10
5
1.013 - 10
101.3
0.1013
-3
249.1
0.2491
0.2491 - 10
-3
3386
3.386
3.386 - 10
0.13332
-6
-6
133.32 - 10
0.1333 - 10
-3
6894.8
6.8948
6.8948 - 10
Force
1 N = 0,101 971 6 kp = 101,97621 p
-3
1 p = 9,806 65 - 10
N
1 kp = 9,806 65 N
Power
-3
1 W = 1 J/s = 1,359 621 6 - 10
PS
1 kW = 1,359 621 6 PS
1 PS = 735,498 75 W = 0,735 498 75 kW
Viscosity
Dinamic viscosity
1 Pa - s = 10 P (Poise)
-1
1 P
= 10
Pa - s
Kinematic viscosity
2
4
1 m
/s = 10
St (Stokes)
-4
2
1 St
= 10
m
/s
CONVERSION FACTORS AND TABLES
Temperature: °C=
Pressure measurement: mm = 0,03937 in in = 25,4 mm
-2
m
f
p=
= pressure =
m
2
According to the international system pressure measurement is
expressed in Pascal.
1 Pa=1N/m
2
=1 Newton/square metre.
The most widely known engineering units for measuring pres-
sure are:
6
Pa
Pascal = Pa (N/m
bar
= bar, mbar = bar x 10
O = mH
O x 10
-3
meter of water column at 4°C = mH
2
2
millimetres of mercury column at 0°C
2
)
theoretical atmosphere
physical atmosphere
O
inch of water column at 4°C
2
inch of mercury column at 0°C
micron of mercury column at 0°C
pound per square inch
bar
mbar
mH
O
2
-5
-2
-3
10
10
0.1020 - 10
-2
10
10
0.1020
4
10
10
102.0
3
1
10
10.20
-3
10
1
-3
10.20 - 10
-3
98.07 - 10
98.07
1
-6
-3
-3
98.07 - 10
98.07 - 10
10
-3
1.333 - 10
1.333
-3
13.59 - 10
0.9807
980.7
10
1.013
1013
10.33
-3
2.491 - 10
2.491
-3
25.4 - 10
-2
3.386 - 10
33.86
0.3453
-6
-3
-6
1.333 - 10
1.333 - 10
13.59 - 10
-2
6.8948 - 10
68.948
0.7031
Energy
J
Work
N - m
Heat quantity
W - s
1 J
=
1 N - m
1
1 W - s
=
3600
1 W - h
=
3,6 - 10
1kW - h
=
4,186 8
1 cal
=
4,186 8
1 kcal
3
- 10
=
9,806 65
1 kp - m
=
1,055 055 9
1 BTU
3
- 10
°F -32
; °F= (1,8 x °C) + 32
1,8
cm = 0,3937 in in = 2,54 cm
m = 39,37 in
in = 2,54x10
-2
m
force
surface
2
), kPa = 10
3
Pa, MPa = 10
6
Pa
-3
O, mmH
O = mH
O x 10
-3
2
2
2
= mmHg, Torr
= at (kp/cm
2
)
= atm
= inc H
O
2
= inc Hg
= µm Hg
= psi
Torr
at
mmH
O
2
2
mmHg
kp / cm
-3
-6
0.1020
7.501 - 10
10.20 - 10
-3
102.0
7.501
10.20 - 10
3
102.0 - 10
7501
10.20
3
10.20 - 10
750.1
1.020
-3
10.20
0.7501
1.020 - 10
-3
10
73.56
0.1
-3
-4
1
73.56 - 10
10
-3
13.59
1
1.359 - 10
4
10
735.6
1
3
10.33 - 10
760
1.033
-3
25.4
1.8684
2.54 - 10
-6
345.3
25.4
3.453 - 10
-3
-3
-6
13.59 - 10
10
1.359 - 10
-3
703.1
51.715
70.31 - 10
W - h
kW - h
0,277 777 8
0,277 777 8
3
6
- 10
- 10
-3
1
10
3
3
10
1
-3
-6
1,63 - 10
1,163 - 10
-3
1,163
1,163 - 10
2,724 069 4
2,724 069 4
- 10
-3
- 10
-6
0,293 071 1
0,293 071 1
-3
- 10
UMWANDLUNGSFAKTOREN UND TABELLEN
°F -32
Temperatur: °C=
; °F= (1,8 x °C) + 32
1,8
Druckmeßung: mm= 0,03937 in in = 25,4 mm
cm = 0,3937 in in = 2,54 cm
m = 39,37 in
f
Kraft
p=
= Druck =
m
2
Oberfläche
Im internationalen System wird Druck in Pascal gemessen.
1Pa=1N/m
2
=1 Newton/m
2
.
Die bekanntesten technischen Einheiten für Druckmessung
sind:
Pascal = Pa (N/m
2
), kPa = 10
3
Pa, MPa = 10
bar
= bar, mbar = bar x 10
-3
Meter Wassersäule bei 4°C = mH
O, mmH
2
Millimeter Quecksilbersäule bei 0°C = mmHg, Torr
Technische Atmosphäre
Physikal. Atmosphäre
Zoll Wassersäule bei 4°C
Zoll Quecksilbersäule bei 0°C
Mikrometer Quecksilbersäule bei 0°C = µm Hg
Pound per square inch
inch
inch
atm
H
O
HG
2
-6
-3
-4
9.869 - 10
4.016 - 10
2.953 - 10
-3
9.869 - 10
4.016
0.2953
9.869
4016
295.3
0.9869
401.6
29.53
-3
-3
0.9869 - 10
0.4016
29.53 - 10
-3
96.78 - 10
39.37
2.896
-6
-3
96.78 - 10
0.03937
2.896 - 10
-3
-2
1.316 - 10
0.5351
3.937 - 10
0.9678
393.7
28.96
1
406.7
29.92
-3
-2
2.458 - 10
1
7.355 - 10
-2
3.342 - 10
13.60
1
-6
-3
-5
1.316 - 10
0.5351 - 10
3.937 - 10
-3
68.04 - 10
27.68
2.036
cal
kcal
kp - m
0,238 845 9
0,238 845 9
0,101 971 6
-3
- 10
859,845 23
859,845 23
0,367 097 8
3
- 10
859,845 23
859,845 23
0,367 097 8
3
3
- 10
- 10
-3
0,426 934 8
1
10
-3
10
1
0,426 934 8
3
- 10
2,342 278 1
2,342 278 1
1
0,251 995 8
0,251 995 8
0,251 995 8
-3
3
- 10
- 10
in = 2,54x10
-2
m
6
Pa
O = mH
O x 10
-3
2
2
= at (kp/cm
2
)
= atm
= inc H
O
2
= inc Hg
= psi
Mi-
PSI
2
crons
Ipf / in
-6
7.501
45.05 - 10
7501
0.14505
6
7.501 - 10
145.05
3
750.1 - 10
14.505
-3
750.1
14.505 - 10
3
73.56 - 10
1.4224
-3
73.56
1.4224 - 10
-3
10
0.01934
3
735.6 - 10
14.224
3
760 - 10
14.68
-3
-3
1.868 - 10
36.126 - 10
3
25.4 - 10
0.4912
-5
1
1.934 - 10
51.715
1
BTU
0,947 817 1
-3
- 10
3,412 141 6
3,412 141 6
3
- 10
3,968 320 7
- 10
-3
3,968 320 7
9,294 910 7
- 10
3
1
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