{"id":355169,"date":"2024-10-20T01:06:42","date_gmt":"2024-10-20T01:06:42","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-3502004\/"},"modified":"2024-10-26T01:22:34","modified_gmt":"2024-10-26T01:22:34","slug":"bs-3502004","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-3502004\/","title":{"rendered":"BS 350:2004"},"content":{"rendered":"

This standard provides conversion factors for units of measurement for a number of quantities, which are, or have been, in general use in engineering, industry and trade. The subjects covered are, broadly, metrology, mechanics and heat; the standard does not deal with purely electrical units.<\/p>\n

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NOTE 1 SI units are normally recommended. However, in certain circumstances use of particular units is required by legislation.<\/p>\n<\/blockquote>\n

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NOTE 2 Electrical and light units are given in BS 5775\u20115 and in BS 5775\u20116, respectively.<\/p>\n<\/blockquote>\n

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NOTE 3 A commentary on imperial and metric systems of measurement and units is given in Annex A.<\/p>\n<\/blockquote>\n

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1<\/td>\nBRITISH STANDARD <\/td>\n<\/tr>\n
2<\/td>\nCommittees responsible for this British\ufffdStandard <\/td>\n<\/tr>\n
3<\/td>\nContents <\/td>\n<\/tr>\n
7<\/td>\n1 Scope
2 Number
2.1 The following prefixes, with meaning, name and symbol as shown in
Table 1 Prefixes denoting decimal multiples or submultiples <\/td>\n<\/tr>\n
8<\/td>\n2.2 The scientific convention is now to use the system shown in
Table 2 Meaning of million, billion, trillion, etc.
2.3 The former convention in the UK was that one billion was 10
3 Length
3.1 The SI unit of length is the metre (symbol m). It is one of the base units of the SI and is t…
3.2 Multiples and submultiples of the metre are formed by using any of the SI prefixes given in\ufffd
3.3 Some units of length having associations with the metric system but not forming part of the S…
3.4 The definitive UK (or imperial) and US unit of length is the yard, legally defined (since\ufffd195…
3.5 The connection between multiples and submultiples of the yard is indicated in the following t… <\/td>\n<\/tr>\n
9<\/td>\n3.6 Some less usual, or more specialized, UK and US named units of length, which are not recommen… <\/td>\n<\/tr>\n
11<\/td>\nTable 3 Length <\/td>\n<\/tr>\n
12<\/td>\n4 Area
4.1 The coherent SI unit of area is the square metre (symbol m
4.2 Areas are also expressed in terms of the squares of any of the multiples and submultiples of …
4.3 A metric unit with a special name is the are (symbol a).
4.4 The connection between various traditional UK and US units of area, and their relationship to… <\/td>\n<\/tr>\n
13<\/td>\n4.5 A specialized UK and US unit of area (used in connection with sections of wire) is the \u201ccircu… <\/td>\n<\/tr>\n
14<\/td>\nTable 4 Area <\/td>\n<\/tr>\n
15<\/td>\nTable 5 Area of section of wire
5 Volume and capacity
5.1 The coherent SI unit of volume is the cubic metre (symbol m
5.2 Volumes are also expressed in terms of the cubes of any of the multiples and submultiples of …
5.3 In the SI no distinction is drawn between units of volume and units of capacity. However, a m… <\/td>\n<\/tr>\n
16<\/td>\n5.4 Units of capacity for the measurement of liquids (and sometimes of dry goods also) have been …
5.5 In the French timber trade the volume of one cubic metre goes under the obsolescent name \u201cst\u00e8…
5.6 The connection between the traditional UK and US units of volume and their relationship to th…
5.7 As with the litre in the metric system, it is customary to regard certain UK and US volumetri…
5.8 UK-units of capacity <\/td>\n<\/tr>\n
17<\/td>\n5.9 US units of capacity
5.10 US units of capacity (liquid measure only) <\/td>\n<\/tr>\n
18<\/td>\n5.11 US units of capacity (dry measure only)
6 Modulus of section, first moment of area
6.1 These quantities have the same dimensions as volume; the coherent SI unit is therefore the me…
6.2 They may also be expressed in terms of the cube of any suitable submultiple of the metre; the…
6.3 The imperial units are the foot cubed (ft
7 Second moment of area, or geometrical moment of inertia <\/td>\n<\/tr>\n
19<\/td>\nTable 6 Volume and capacity <\/td>\n<\/tr>\n
20<\/td>\nTable 7 Volume and capacity <\/td>\n<\/tr>\n
21<\/td>\nTable 8 Volume and capacity <\/td>\n<\/tr>\n
22<\/td>\nTable 9 Relationship between UK (imperial) and US\ufffdunits of capacity
Table 10 Second moment of area <\/td>\n<\/tr>\n
23<\/td>\n8 Plane angle
8.1 The coherent SI unit of plane angle is the radian (symbol rad), a coherent derived
8.2 Traditional angular units which are of such practical importance that they have been retained…
8.3 A unit of plane angle used in some mainland European countries is the grade ( <\/td>\n<\/tr>\n
24<\/td>\nTable 11 Plane angle
9 Solid angle
10 Time
10.1 The SI unit of time is the second (symbol s), a base unit. It is now defined as the duration…
10.2 Prior to 1967 the second was defined as a specified fraction of the time taken by the Earth …
10.3 Other units of time of such practical importance that they are retained for general use in c…
10.4 Longer durations of time are conveniently expressed in terms of the week, month or year, but… <\/td>\n<\/tr>\n
25<\/td>\n11 Linear velocity (speed)
11.1 The coherent SI unit of linear velocity is the metre per second (symbol m\/s), a coherent der…
11.2 Multiples and submultiples of the metre per second are formed by using any of the SI prefixe…
11.3 A metric unit often used for speed is the kilometre per hour (km\/h).
11.4 Various speed units used in the imperial system are:
11.5 The knot, one nautical mile per hour, is a unit used for speed in nautical and aeronautical … <\/td>\n<\/tr>\n
26<\/td>\n12 Angular velocity
12.1 The coherent SI unit of angular velocity is the radian per second (rad\/s), a derived unit.
12.2 Other units used are: <\/td>\n<\/tr>\n
27<\/td>\nTable 12 Linear velocity <\/td>\n<\/tr>\n
28<\/td>\nTable 13 Angular velocity and velocity of rotation
13 Frequency
13.1 The coherent SI unit of frequency (of a wave or periodic phenomenon) is the hertz (symbol\ufffdHz…
13.2 The coherent SI unit of rotational frequency (e.g. a frequency associated with the mechanica…
13.3 Another very commonly used unit of rotational frequency is the revolution per minute (rev\/mi…
13.4 Corresponding angular velocities are obtainable from <\/td>\n<\/tr>\n
29<\/td>\n14 Acceleration
14.1 The coherent SI unit of acceleration is the metre per second squared (symbol m\/s
14.2 The centimetre per second squared (cm\/s
14.3 The unit in the imperial system for acceleration is the foot per second squared (ft\/s
14.4 The standard acceleration of
Table 14 Acceleration <\/td>\n<\/tr>\n
30<\/td>\n15 Mass
15.1 The coherent SI unit of mass is the kilogram (symbol kg), a base unit. It is defined as equa…
15.2 Because the name of the base unit of mass already contains the SI prefix \u201ckilo\u201d, multiples a…
15.3 Some other units of mass having associations with the metric system are:
15.4 The primary unit of mass in the imperial system and in the USA is the pound (lb). In the UK …
15.5 The connection between multiples and submultiples of the pound is indicated in the following… <\/td>\n<\/tr>\n
31<\/td>\n15.6 Some more specialized UK and\/or USA named units of mass are: <\/td>\n<\/tr>\n
32<\/td>\nTable 15 Mass <\/td>\n<\/tr>\n
33<\/td>\nTable 16 Mass <\/td>\n<\/tr>\n
34<\/td>\nTable 17 Mass <\/td>\n<\/tr>\n
35<\/td>\n16 Mass per unit length (or lineic mass)
16.1 The coherent SI unit of mass per unit length is the kilogram per metre (symbol kg\/m), a deri…
16.2 Two specialized units of linear density used in the textile industry and which have an assoc…
16.3 A selection of imperial units used in industry, often for wires, rods etc. is: <\/td>\n<\/tr>\n
36<\/td>\nTable 18 Mass per unit length (lineic mass) <\/td>\n<\/tr>\n
37<\/td>\n17 Mass per unit area (areic mass)
17.1 The coherent SI unit is the kilogram per square metre (kg\/m
17.2 Other commonly used metric units are:
17.3 A selection of imperial units is:
18 Specific surface, or area per unit mass
18.1 The coherent SI unit is the square metre per kilogram (m
18.2 Other commonly used metric units are:
18.3 A selection of imperial units is: <\/td>\n<\/tr>\n
38<\/td>\nTable 19 Mass per unit area (areic mass) <\/td>\n<\/tr>\n
39<\/td>\nTable 20 Specific surface, or area per unit mass <\/td>\n<\/tr>\n
40<\/td>\n19 Area per unit capacity
Table 21 Area per unit capacity
20 Density
20.1 The coherent SI unit of density is the kilogram per cubic metre (kg\/m
20.2 Other commonly used metric units are:
20.3 A selection of imperial units is: <\/td>\n<\/tr>\n
41<\/td>\nTable 22 Density (volumic mass) <\/td>\n<\/tr>\n
42<\/td>\n21 Mass concentration
21.1 In practice \u201cconcentration\u201d is \u201camount of substance concentration\u201d, e.g. \u201cmol\/l\u201d. Following …
21.2 The coherent SI unit for the expression of mass concentration
21.3 Some imperial and US units for the statement of mass concentration are: <\/td>\n<\/tr>\n
43<\/td>\nTable 23 Mass concentration <\/td>\n<\/tr>\n
44<\/td>\n22 Specific volume
22.1 The coherent SI unit of specific volume (which is the reciprocal of density) is the cubic me…
22.2 Another commonly used metric unit is:
22.3 A selection of imperial units is:
23 Mass rate of flow
23.1 The coherent SI unit of mass rate of flow is the kilogram per second (kg\/s), a derived unit.
23.2 Another commonly used metric unit is the kilogram per hour (kg\/h).
23.3 A selection of imperial units is: <\/td>\n<\/tr>\n
45<\/td>\nTable 24 Specific volume <\/td>\n<\/tr>\n
46<\/td>\nTable 25 Mass rate of flow
24 Volume rate of flow
24.1 The coherent SI unit of volume rate of flow is the cubic metre per second
24.2 Some other commonly used metric units are:
24.3 A selection of imperial units is: <\/td>\n<\/tr>\n
47<\/td>\nTable 26 Volume rate of flow <\/td>\n<\/tr>\n
48<\/td>\n25 Traffic factors
Table 27 Fuel consumption
Table 28 Fuel consumption <\/td>\n<\/tr>\n
49<\/td>\n26 Moment of inertia
26.1 The coherent SI unit of moment of inertia is the kilogram metre squared (kg\u00b7m
26.2 Some other metric units which have been used are:
26.3 A selection of imperial units is:
Table 29 Moment of inertia
27 Momentum (linear)
28 Angular momentum <\/td>\n<\/tr>\n
50<\/td>\n29 Force
29.1 The coherent SI unit of force is the newton (N), a derived unit with a special name. Express…
29.2 Other metric units of force of historical or practical importance are:
29.3 In the foot-pound-second system the coherent force unit is the poundal (pdl).
29.4 The kilogram-force (kgf), and the pound-force (lbf) and its associated units, are both exact… <\/td>\n<\/tr>\n
51<\/td>\nTable 30 Force <\/td>\n<\/tr>\n
52<\/td>\n30 Weight
30.1 Meaning of \u201cweight\u201d
30.2 Relationship between force of gravity and mass
30.3 Accurate weight conversions
31 Moment of force, or torque
31.1 The coherent SI unit of moment (of force) is the newton metre (N\u00b7m), a derived unit. See Not…
31.2 A metric unit often used for moment, or torque, in mainland European countries is the kilogr…
31.3 A selection of imperial units is: <\/td>\n<\/tr>\n
54<\/td>\nTable 31 Moment of force (torque) <\/td>\n<\/tr>\n
55<\/td>\n32 Force per unit length
32.1 The coherent SI unit is the newton per metre (N\/m).
32.2 Another metric unit that may still be encountered is the dyne per centimetre (dyn\/cm).
33 Pressure
33.1 General <\/td>\n<\/tr>\n
56<\/td>\n33.2 Liquid columns <\/td>\n<\/tr>\n
57<\/td>\n33.3 Atmospheres
33.4 \u201cAbsolute\u201d and \u201cgauge\u201d pressure <\/td>\n<\/tr>\n
58<\/td>\n34 Stress <\/td>\n<\/tr>\n
59<\/td>\nTable 32 Pressure <\/td>\n<\/tr>\n
60<\/td>\nTable 33 Pressure <\/td>\n<\/tr>\n
61<\/td>\nTable 34 Pressure <\/td>\n<\/tr>\n
62<\/td>\n35 Viscosity, dynamic
35.1 The coherent SI unit of dynamic viscosity is the pascal second (Pa\u00b7s), which may also be exp…
35.2 The poise (P) is the corresponding CGS unit.
35.3 Other metric and imperial units that have been used for dynamic viscosity are: <\/td>\n<\/tr>\n
63<\/td>\nTable 35 Viscosity (dynamic) <\/td>\n<\/tr>\n
64<\/td>\n36 Viscosity, kinematic
36.1 The coherent SI unit of kinematic viscosity (which is dynamic viscosity divided by density) …
36.2 The corresponding CGS unit is the stokes (St).
36.3 Another metric unit sometimes used is the metre squared per hour (m
36.4 A selection of imperial units is:
36.5 The units referred to in <\/td>\n<\/tr>\n
65<\/td>\nTable 36 Viscosity (kinematic) <\/td>\n<\/tr>\n
66<\/td>\n37 Energy
37.1 General <\/td>\n<\/tr>\n
67<\/td>\n37.2 Heat units <\/td>\n<\/tr>\n
68<\/td>\n38 Power
38.1 The coherent SI unit for all forms of power, including heat flow rate, is the watt (symbol\ufffdW…
38.2 Two metric technical units of power are the kilogram-force metre per second (kgf\u00b7m\/s) and th…
38.3 Similar technical units in the imperial system are the foot pound-force per second (ft\u00b7lbf\/s…
38.4 The following is a selection of heat flow units shown in terms of the watt (see <\/td>\n<\/tr>\n
69<\/td>\nTable 37 Energy <\/td>\n<\/tr>\n
70<\/td>\nTable 38 Energy <\/td>\n<\/tr>\n
71<\/td>\nTable 39 Power <\/td>\n<\/tr>\n
72<\/td>\n39 Temperature, including temperature difference or interval
39.1 The SI unit of temperature is the kelvin (K). It is one of the base units of the SI and is d…
39.2 The temperature unit recognized for use in conjunction with the SI, is the degree Celsius (\u00b0…
39.3 Traditional in practical use in the UK and USA is Fahrenheit temperature, which has now been…
39.4 For thermodynamic temperatures, the degree Rankine (\u00b0R) is still occasionally used. The unit…
39.5 In the 1959 edition of this standard, for
39.6 For the purpose of practical measurements the CIPM adopted in 1968 the \u201cInternational Practi… <\/td>\n<\/tr>\n
73<\/td>\nTable 40 Equivalent values on four temperature scales
40 Specific energy
40.1 There are several different terms for energy per unit mass which are used in different conte…
40.2 Other units are:
40.3 Corresponding imperial units are: <\/td>\n<\/tr>\n
74<\/td>\n41 Heat content, volume basis
41.1 The SI unit for this quantity, which is mainly used in connection with the combustion of gas…
41.2 Units that have been in common use are:
41.3 Corresponding imperial units are:
41.4 In <\/td>\n<\/tr>\n
75<\/td>\nTable 41 Specific energy <\/td>\n<\/tr>\n
76<\/td>\nTable 42 Calorific value, volume basis <\/td>\n<\/tr>\n
77<\/td>\nTable 43 Calorific value of gases, volume basis (with differing reference conditions) <\/td>\n<\/tr>\n
78<\/td>\nTable 44 Conversion factors previously used by the UK Gas Industry
42 Specific heat capacity
42.1 The SI unit of specific heat capacity is the joule per kilogram kelvin [J\/(kg\u00b7K)].
42.2 The degree Celsius is often used in the expression of the above unit:
42.3 Other metric units are: <\/td>\n<\/tr>\n
79<\/td>\n42.4 Corresponding imperial units are:
43 Specific entropy
44 Heat capacity, volume basis
44.1 The SI unit of heat capacity, volume basis, is the joule per cubic metre kelvin [J\/(m
44.2 The degree Celsius is often used in the expression of the above unit:
44.3 Other metric units are:
44.4 The corresponding imperial unit is: <\/td>\n<\/tr>\n
80<\/td>\n45 Heat flux density
45.1 The SI unit for this quantity, which is sometimes known as intensity of heat flow rate, and …
45.2 Other metric units are:
45.3 Corresponding units in the imperial system are: <\/td>\n<\/tr>\n
81<\/td>\nTable 45 Specific heat, mass basis <\/td>\n<\/tr>\n
82<\/td>\nTable 46 Heat capacity, volume basis
Table 47 Heat flux density, intensity of heat flow rate <\/td>\n<\/tr>\n
83<\/td>\n46 Thermal conductance (heat transfer coefficient)
46.1 The SI unit is the watt per square metre kelvin [W\/(m
46.2 The degree Celsius (\u00b0C) is often used in the expression of the above unit:
46.3 Other metric units are:
46.4 The imperial unit is:
Table 48 Thermal conductance <\/td>\n<\/tr>\n
84<\/td>\n47 Thermal conductivity
47.1 The SI unit is the watt per metre kelvin [W\/(m\u00b7K)]
47.2 The degree Celsius (\u00b0C) is often used in the expression of the above unit:
47.3 Other metric units are:
47.4 Two imperial units are:
Table 49 Thermal conductivity <\/td>\n<\/tr>\n
85<\/td>\n48 Thermal resistivity
Table 50 Thermal resistivity <\/td>\n<\/tr>\n
86<\/td>\n49 Heat release rate
49.1 The SI unit for this quantity is the watt per cubic metre (W\/m
49.2 Other metric units are:
49.3 A similar imperial unit is:
Table 51 Heat release rate
50 Thermal diffusivity <\/td>\n<\/tr>\n
87<\/td>\nAnnex A (informative) Commentary on imperial and metric systems of measurement and units
A.1 Development of units
A.2 Unit systems and coherence
A.3 The metric system of measurement <\/td>\n<\/tr>\n
88<\/td>\nTable A.1 Other metric systems
A.4 The International System of units (SI)
Table A.2 Base and supplementary quantities, units and symbols in the SI system <\/td>\n<\/tr>\n
89<\/td>\nA.5 Imperial systems
A.6 Comparison of United Kingdom (UK or imperial) and United States systems of measurement <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Conversion factors for units<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
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