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        Formule e tabelle, equivalenze e conversioni

UNITÀ

Lunghezza: unità

1 metro (m) = 10 decimetri (dm) = 100 centimetri 
(cm) = 1000 millimetri (mm)
1 kilometro (km) = 1000 metri (m)
1 miglio marino = 1852 m
1 gomena = 1 85 m 
1 braccio = 1,83 m
Equipollenze                                 
in unità anglo-americane               

1 mm     = 0,04 inch (in) o (") - pollice
1 cm  = 0,4 inch (in) o (") - pollice
1 cm = 0,03 foot (ft) o (') - piede
1 m = 3,3 foot (ft) o (') - piede
1 m  = 1,09 yard (yd) - iarde
1 m = 0,55 fathom (fm) - braccio
1 km  = 0,54 nautical mile (m) - miglia marine
1 km = 0,62 statute mile - miglia terrestri

1 in  = 25,4 mm
1 in = 2,54 cm
1 ft  = 30,5 cm 
1 ft  = 0,3 m 
1 yd = 0,9 m
1 fm  = 1,83 m
1 miglio nautico  = 1,85 km
1 miglio terrestre = 1 609 m
Approssimazioni rapide                

10 cm ~ 4 in

30 cm ~ 1 ft

1 m ~ 40 in

Superficie: unità

1 metro quadrato (m2-mq) = 100 decimetri quadrati (dm2)
= 10000 centimetri quadrati (cm2)
= 1 000 000 millimetri quadrati (mm2)
1 kilometro quadrato (km2) = 1 000 000 m
1 ara (a) = 100 m2
1 ettaro (ha) = 10 000 m2
 

 

1 mm2  = 0,0015 in2

◄  Equipollenze    
in unità      anglo-americane

1 cm2  = 0,15 in2
1 m2 =  10,7 ft2
1 ha  = 2,47 acro
     

1 in2  = 645 mm2
1 in2 = 6,45 cm2
1 ft2 = 0,09 m2
1 acre = 0,4 ha
     
10 cm2  ~ 1,5 in2 Approssimazion rapida
  1 dm2 ~ 15 in2
1 m2 ~ 11 ft2
  10 m2 ~ 12 yd2

Volume, capacità: unità

  1 metro cubo (m3= mc) = 1000 decimetri cubi (dm3)
= 1 000 000 centimetri cubi (cm3)
1 litro (l) = 1000 centimetri cubi (cm3)
= 1 decimetro cubo (dm3)
1 metro cubo (m3) = 1 000 litri (l)
Equipollenze in unit� anglo-americane   

1 cm3 = 0,06 in3  
1 dm3   = 0,03 ft3
1 m3 = 35,3 ft3
1 m3 = 1,3 yd
1 l = 0,22 gallon (gal)
1 l = 0,26 US gallon - gallone
1l = 1,65 pint - pinta
11 = 2,1 US pints
   

1 in3 1,64 cm  
1 ft3  = 28,3 dm3
1 ft3 = 0,03 m3
1 yd3 = 0,76 m3
1 gal = 4,5 l
1 US gal = 3,8 l 
1 pint   = 0,57 l 
1 US pint = 0,47 l
 
Approssimazioni rapide                      9 l ~ 2 gal
1 m3 ~ 35 ff3

Peso, massa, forza: unità

Peso, massa
1 kilogrammo (kg) = 1000 grammi (g)
1 tonnellata (t) = 1 000 kilogrammi (kg)

 

1 g

= 0,03 ounce (oz) Equipollenze 
in unità 
anglo-americane
  1 kg = 2,2 pounds (lb)
  1 kg = 0,02 hundredweight (cwt)
  1 t  = 0,98 (long) tonne
 

1 oz =  28,3 g  
  1 lb = 0,45 kg
  1 cwt = 50,8 kg
  1 (ling) t =  1,01 t
 

10 kg ~ 22 lb

Approssimazion rapida
50 kg ~ 1 cwt  

"Forza"
1 kilogrammo-forza = 1000 grammi-forza (gf)
1 kilogrammo-forza (kgf) = 9,81 newtons (N)
1 decanewton (daN) = 1 0 newtons (N)

1 kgf~ 1 daN

Approssimazion rapida

Velocità: unità

1 metro al secondo (m/s)
1 nodo (n) = 1 miglio marino * per ora = 1852 m/h = 0,51 m/s

Velocità di una barca

n ~ m/s ~ km/h   n ~ m/s ~ km/h

0,5

0,3 0,9 8 4,1 14,8

1

0,5 1,8 8,5 4,4 15,7

1,5

0,8 2,8 9 4,6 16,7

2

1,0 3,7 9,5 4,9 17,6

2,5

1,3 4,6 10 5,1 18,5

3

1,5 5,6 10,5 5,4 19,4

3,5

1,8 6,5 11 5,7 20,4

4

2,1 7,4 11,5 5,9 21,3

4,5

2,3 8,3 12 6,2 22,2

5

2,6 9,3 12,5 6,4 23,1

5,5

2,8 10,2 13 6,7 24,1

6

3,1 11,1 13,5 6,9 25

6,5

3,3 12 14 7,2 25,9

7

3,6 13 14,5 7,5 26,9

7,5

3,9 13,9 15 7,7 27,8a 

 

Per approssimazione

Esempio: 10 nodi equivalgono a:

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*Aftenzione: In alcuni paesi angiosassoni, le distanze possono essere misurote in "statute 
mile" o, semplicemente, "mile" = 1609 m/h 
Ï "statute mile" (miglio terrestre) = 0,87 miglio nautico

Pressione, potenza, luminosità, suono: unità

Pressione

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1 atmosfera (Atm) = 1 kgF/cm2 = 101 kN/m2
1 bar ~ 100 000 Pascal (Pa) ~ 1 013 millibar (mb)
1 millibar (mb) = 100 N/m2 = 100 Pa
1 kgf/m2 = 9,81 N/m2
1 PSI (Pound/Square Inch) = 689 mb

1 kg/mm2 =  1 422 ib/inch2 Corrispondenze 
in unità 
anglo-americane

• 

  1 lb/in2  

= 0,0007 kg/mm2

Potenza

Potenza = Forza x Velocità
1 cavallo vapore (CV) = 75 kg x m/s
1 kilowatt (kW) = 1,34 cavallo vapore (CV) 
in inglese: Horse Power (hp)
1 CV (o hp) = 0,74 kW

  Luce

L'intensità luminosa (I) si esprime in candele (cd) 
L'illuminazione (E) si esprime in Lux (Lx)
L'illuminazione cambia in modo inversamente proporzionale al quadrato 
delia distanza (r) della fonte luminosa:

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  Suono

Velocità del suono in acqua: 1 500 m/sec.

Temperatura: unità

°F

°C

-20

-28,9

- 10

-23,3

0

- 17,8

10

- 12,2

20

-6,7

30

- 1,1

40

  4,4

50

10,0

60

15,6

70

24,1

80

26,7

90

32,2

100

37,8

110

43,3

120

48,9

130

54,4

140

60,0

150

65,6

160

71,1

170

76,7

180

77,9

190

87,8

200

93,3

210

98,9

 

°F

°C

-30

-22

-20

-4

- 10

14

0

32

10

50

20

68

30

86

40

104

50

122

60

140

70

158

80

176

90

194

100

212

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Conversione di "kW" in "cv", di "CV" in "kW"

KW

CV

0,2

     0,3     

0,4

0,5

0,6

0,8

0,8

1,1

1

1,4

2

2,7

4

5,4

6

8,2

8

10,9

10

14

20

27

30

41

40

54

50

68

60

82

70

95

80

109

90

122

100

136

200

272

300

408

400

544

500

680

600

816

700

952

800

1088

900

1224

1000

1360

1100

1496

1200

1632

1300

1768

1400

1904

1500

2040

 

CV

KW

0,5

0,4

1

0,7

2

1,5

3

2,2

4

8,2

6

3,7

8

4,4

10

5,9

20

7,4

30

15

40

22

60

29

80

44

100

59

200

74

300

147

400

221

500

294

600

368

700

442

800

515

900

589

1000

662

1200

736

1400

883

1600

1178

1800

1325

2000

1472

 

FORMULE 

Superficie

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Superficie, perimetro

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Superficie, volume

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Pressione nell'ambiente marino

Profondità 
(m)

Pressione idrosfafica 
Atmosfera kgf/cm2

(Pressione 
idrostatica)

0

1

 

10

2 o l + 1

20

3 o 2 + l

40

5 o 4 + 1

50

6 o 5 + 1

60

7 o 6 + 1

100

11  o 10 + l

200

21 o 20 + 1

300

31 o 30 + 1

400

41 o 40 + 1

500

51 o 50 +1

1000

101 o 100 +1

Pressione (kgf/cm2) = 0,1 x prof. (m) + 1

(massa specifica dell'acqua    0,001 kgf/cm3)

Forza di gravità e spinta verticale

Ga (kgf) = Peso del corpo in aria

Ga (kgf) = Volume del corpo (mc) x d (massa specifica del corpo in kgf /mc]

F (kgf) = Spinta verticale (verso l'alto)

F (kgf) = Volume del corpo (mc) x dw (massa specifica dell'acqua in

kgf/mc)

Gw (kgf) = Peso del corpo in acqua

Gw (kgf) = Peso del corpo in aria (kgf) - spinta verticale (kgf)

Gw (kgf) = Ga – F

Gw (kgf) = Ga (1 – 1*/d)

* 1 per l'acqua dolce; 1,02 per l'acqua di mare

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Spinta verticale supe-riore al peso del corpo in aria.

La differenza "peso del corpo in aria - spinta verticale" è negativa.

Il corpo (1 ) galleggia.

Spinta verticale uguale al peso del corpo in aria.

La differenza "peso del corpo in aria - spinta verticale" è nulla.

Il corpo (2) rimane in equilibrio a mezz'ac-qua.

Spinta verticale inferiore al peso del corpo in aria.

La differenza "peso del corpo in aria - spinta verticale" è positiva.

Il corpo (3) va a fondo.

Tabella delle radici quadrate dei numeri da 0 a 499

 

C3

B2
 

A

 

N

0

1

2

3

4

5

6

7

8

9

0

0,0000

1,0000

1,4142

1,7321

2,0000

2,2361

2,4495

2,6458

2,8284

3,0000

1

3,1623

3,3166

3,4641

3,6056

3,7417

3,8730

4,0000

4,1231

4,2426

4,3589

B1     

2

4,4721

4,5826

4,6904

4,7958

4,8990

5,0000

5,0990

5,1962

5,2915

5,3852

 

3 5,4772 5,5678 5,6569 5,7446 5,8310 5,9161 6,0000 6,0828

6,1644

6,2450

4

6,3246

6,4031

6,4807

6,5574

6,6332

6,7082

6,7823

6,8557

6,9282

7,0000

5

7,0711

7,1414

7,2111

7,2801

7,3485

7,4162

7,4833

7,5498

7,6158

7,6811

6

7,7460

7,8102

7,8740

7,9373

8,0000

8,0623

8,1240

8,1854

8,2462

8,3066

7

8,3666

8,4261

8,4853

8,5440

8,6023

8,6603

8,7178

8,7750

8,8318

8,8882

8

8,9443

9,0000

9.0554

9,1104

9,1652

9,2195

9,2736

9,3274

9,3808

9,4340

9

9,4868

9,5394

9,5917

9,6437

9,6954

9,7468

9,7980

9,8489

9,8995

9,9499

10

10,0000

10,0499

10,0995

10,1489

10,1980

10,2470

10,2956

10,3441

10,3923

10,4403

11

10,4881

10,5357

10,5830

10,6301

10,6771

10,7238

10,7703

10,8167

10,8628

10,9087

12

10,9545

11,0000

11,0454

11,0906

11,1355

11,1803

11,2250

11,2694

11,3137

11,3578

13

11,4018

11,4455

11,4891

11,5326

11,5758

11,6190

11,6619

11,7047

11,7473

11,7898

14

11,8322

11,8743

11,9164

11,9583

12,0000

12,0416

12,0830

12,1244

12,1655

12,2066

15

12,2474

12,2882

12,3288

12,3693

12,4097

12,4499

12,4900

12,5300

12,5698

12,6095

16

12,6491

12,6886

12,7279

12,7671

12,8062

12,8452

12,8841

12,9228

12,9615

13,0000

17

13,0384

13,0767

13,1149

13,1529

13,1909

13,2288

13,2665

13,3041

13,3417

13,3791

18

13,4164

13,4536

13,4907

13,5277

13,5647

13,6015

13,6382

13,6748

13,7113

13,7477

19

13,7840

13,8203

13,8564

13,8924

13,9284

13,9642

14,0000

14,0357

14,0712

14,1067

20

14,1421

14,1774

14,2127

14,2478

14,2829

14,3178

14,3527

14,3875

14,4222

14,4568

21

14,4914

14,5258

14,5602

14,5945

14,6287

14,6629

14,6969

14,7309

14,7648

14,7986

22

14,8324

14,8661

14,8997

14,9332

14,9666

15,0000

15,0333

15,0665

15,0997

15,1327

23

15,1656

15,1987

15,2315

15,2643

15,2971

15,3297

15,3623

15,3948

15,4272

15,4596

24

15,4919

15,5242

15,5563

15,5885

15,6205

15,6525

15,6844

15.7162

15,7480

15,7797

25

15,8114

15,8430

15,8745

15,9060

15,9324

15,9657

16,0000

16,0312

16,0624

16,0935

26

16,1245

16,1555

16,1664

16,2173

16,2481

16,2788

16,3095

16,3401

16,3707

16,4012

27

16,4317

16,4621

16,4924

16,5227

16,5529

16,5831

16,6132

16,6433

16,6733

16,7033

28

16,7332

16,7631

16,7929

16,8226

16,8523

16,8819

16,9115

16,9411

16,9706

17,0000

29

17,0294

17,0587

17;0880

17,1172

17,1464

17,1756

17,2047

17,2337

17,2627

17,2916

30

17,3205

17,3494

17,3781

17,4069

17,4356

17,4642

17,4929

17,5214

17,5499

17,5784

31

17,6068

17,6352

17,6635

17,6918

17,7200

17,7482

17,7764

17,8045

17,8326

17,8606

C1C  

32

17,8885

17,9165

17,9444

17,9722

18,0000

18,0278

18,0555

18,0831

18,1108

18,1384
 

33

18,1658

18,1934

18,2209

16,2483

18,2757

18,3030

18,3303

18,3576

18,3648

18,4120

34

16,4391

18,4662

18,4932

18,5203

18,5472

18,5742

18,6011

18,6279

18,6548

18,6815

35

18,7083

18,7350

18,7617

18,7883

18,8149

18,8414

18,8680

18,8944

18,9209

18,9473

36

18,9737

19,0000

19,0263

19,0526

19,0788

19,1050

19,1311

19,1572

19,1833

19,2094

37

19,2354

19,2614

19,2873

19,3132

19,3391

19,3649

19,3907

19,4165

19,4422

19,4679

38

19,4936

19,5192

19,5448

19,5704

19,5959

19,6214

19,6469

19,6723

19,6977

19,7231

39

19,7484

19,7737

19,7990

19,8242

19,8494

19,8746

19,8997

19,9249

19,9499

19,9750

40

20,0000

20,0250

20,0499

20,0749

20,0998

20,1246

20,1494

20,1742

20,1990

20,2237

41

20,2485

20,2731

20,2978

20,3224

20,3470

20,3715

20,3961

20,4206

20,4450

20,4695

42

20,4939

20,5183

20,5426

20,5670

20,5913

20,6155

20,6398

20,6640

20,6882

20,7123

43

20,7364

20,7605

20,7846

20,8087

20,8327

20 8567

20,8806

20,9045

20,9284

20,9523

44

20,9762

21,0000

21,0238

21,0476

21,0713

21,0950

21,1187

21,1424

21,1660

21,1896

45

21,2132

21,2368

21,2603

21,2838

21,3073

21,3307

21,3542

21,3776

21,4009

21,4243

46

21,4476

21,4709

21,4942

21,5174

21,5407

21,5639

21,5870

21,6102

21,6333

21,6564

47

21,6795

21,7025

21,7256

21,7486

21,7715

21,7945

21,8174

21,8403

21,8632

21,8861

48

21,9089

21,9317

21,9545

21,9773

22,0000

22,0227

22,0454

22,0681

22,0907

22,1133

49

22,1359

22,1585

22,1811

22,2036

22,2261

22,2486

22,2711

22,2935

22,3159

22,3383

Esempio di uso della tabella

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Tratto da "Statistique et probabilité" collana Aide-Mémoire TECHNOR, doc. 15 e 
16, Delagrave 1985. Con l'autorizzazione dell'editore.

Tabella delle radici quadrate dei numeri da 500 a 999

  B3
 

A3

 
 

N

0

1

2

3

4

5

6

7

8

9

50

22,3607

22,3830

22,4054

22,4277

22,4499

22,4722

22,4944

22,5167

22,5389

22,5610

51

22,5832

22,6053

22,6274

22,6495

22,6716

22,6936

22,7156

22,7376

22,7596

22,7816

52

22,8035

22,8254

22,8473

22,8692

22,8910

22,9129

22,9347

22,9565

22,9783

23,0000

53

23,0217

23,0434

23,0651

23,0868

23,1084

23,1301

23,1517

23,1733

23,1948

23,2164

54

23,2379

23,2594

23,2809

23,3024

23,3238

23,3452

23,3666

23,3880

23,4094

23,4307

55

23,4521

23,4734

23,4947

23,5160

23,5372

23,5584

23,5797

23,6008

23,6220

23,6432

56

23,6643

23,6854

23,7065

23,7276

23,7487

23,7697

23,7908

23,8118

23,8328

23,8537

A1A2

57

23,8747

23,8956

23,9165

23,9374

23,9583

23,9792

24,0000

24,0208

24,0416

24,0624

 

58

24,0832

24,1039

24,1247

24,1454

24,1661

24,1868

24,2074

24,2281

24 2487

24,2693

59

24,2899

24,3105

24,3311

24,3516

24,3721

24,3926

24,4131

24,4336

24,4540 24,4745

60

24,4949

24,5153

24,5357

24.5561

24,5764

24,5967

24,6171

24,6374

24,6577

24,6779

61

24,6982

24,7184

24,7386

24,7588

24,7790

24,7992

24,8193

24,8395

24,8596

24,8797

62

24,8998

24,9199

24,9399

24,9600

24,9800

25,0000

25,0200

25,0400

25,0599

25,0799

63

25,0998

25,1197

25,1396

25,1595

25,1794

25,1992

25,2190

25,2389

25,2587

25,2784

64

25,2982

25,3180

25,3377

25,3574

25,3772

25,3969

2514165

25,4362

25,4558

25,4755

65

25,4951

25,5147

25,5343

25,5539

25,5734

25,5930

25,6125

25,6320

25,6515

25,6710

66

25,6905

25,7099

25,7294

25,7488

25,7682

25,7876

25,8070

25,8263

25,8457

25,8650

67

25,8844

25,9037

25,9230

25,9422

25,9615

25,9808

26,0000

26,0192

26,0384

26,0576

68

26,0768

26,0960

26,1151

26,1343

26,1534

26,1725

26,1916

26,2107

26,2298

26,2488

69

26,2679

26,2869

26,3059

26,3249

26,3439

26,3629

26,3818

26,4008

26,4197

26,4386

70

26,4575

26,4764

26,4953

26,5141

26,5330

26,5518

26,5707

26,5895

26,6083

26,6271

71

26,6458

26,6646

26,6833

26,7021

26,7208

26,7395

26,7582

26,7769

26,7955

26,8142

72

26,8328

26,8514

26,8701

26,8887

26,9s072

26,9258

26,9444

26,9629

26,9815

27,0000

73

27,0185

27,0370

27,0555

27,0740

27,0924

27,1109

27,1293

27,1477

27,1662

27,1846

74

27,2029

27,2213

27,2397

27,2580

27,2764

27,2947

27,3130

27,3313

27,3496

27,3679

75

27,3861

27,4044

27,4226

27,4408

27,4591

27,4773

27,4955

27,5136

27,5318

27,5500

76

27,5681

27,5862

27,6043

27,6225

27,6405

27,6586

27,6767

27,6948

27,7128

27,7308

77

27,7489

27,7669

27,7849

27,8029

27,8209

27,8388

27,8568

27,8747

27,8927

27,9106

78

27 9285

27,9464

27,9643

27,9821

28,0000

28,0179

28,0357

28,0535

28 0713

28,0891

79

28,1069

28,1247

28,1425

28,1603

28,1780

28,1957

28,2135

28,2312

28,2489

28,2666

80

28,2843

28,3019

28,3196

28,3373

28,3549

26.3725

28,3901

28,4077

28,4253

28,4429

81

28,4605

28,4781

28,4956

28,5132

28,5307

28,5482

28,5657

28,5832

28,6007

28,6182

82

28,6356

28,6531

28,6705

28,6880

28,7054

28,7228

28,7402

28,7576

28,7750

28,7924

83

28,8097

28,8271

28,8444

28,8617

28,8791

28,8964

28,9137

28,9310

28,9482

28,9655

84

28,9828

29,0000

29,0172

29,0345

29,0517

29,0689

29,0861

29,1033

29,1204

29,1376

85

29,1548

29,1719

29,1890

29,2062

29,2233

29,2404

29,2575

29,2746

29,2916

29,3067

86

29,3258

29,3428

29,3598

29,3769

29,3939

29,4109

29 4279

29,4449

29,4618

29,4788

87

29,4958

29,5127

29,5296

29,5466

29 5635

29,5804

29,5973

29,6142

29,6311

29,6479

88

29,6648

29,6816

29,6985

29,7153

29,7321

29,7489

29,7658

29,7825

29,7993

29,8161

89

29,8329

29,8496

29,8664

29,8831

29;8998

29,9166

29,9333

29,9500

29,9666

29,9833

B1B2

90

30,0000

30,0167

30,0333

30,0500

30,0666

30,0832

30,0998

30,1164

30,1330

30,1496

 

91

30,1662

30,1828

30,1993

30,2159

30,2324

30,2490

30,2655

30,2820

30,2985

30,3150

92

30,3315

30,3480

30,3645

30,3809

30,3974

30,4138

30,4302

30,4467

30,4631

30,4795

93

30,4959

30,5123

30,5287

30,5450

30,5614

30,5778

30,5941

30,6105

30,6268

30,6431

94

30,6594

30,6757

30,6920

30,7083

30,7246

30,7409

30,7571

30,7734

30,7896

30,8058

95

30,8221

30,8383

30,8545

30,8707

30,8869

30,9031

30,9192

30,9354

30,9516

30,9677

96

30,9839

31,0000

31,0161

31,0322

31,0483

31,0644

31,0805

31,0966

31,1127

31,1288

97

31,1448

31,1609

31,1769

31,1929

31.2090

31,2250

31,2410

31,2570

31,2730

31,2890

98

31,3050

31,3209

31,3369

31,3528

31,3688

31,3847

31,4006

31,4166

31,4325

31,4484

99

31,4643

31,4802

31,4960

31,5119

31,5278

31,5436

31,5595

31,5753

31,5911

31,6070

 

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