This standard specifies the names and symbols of quantities and units of space and time; when appropriate, conversion factors are given. This standard applies to all fields of science and technology. GB 3102.1-1993 Quantities and units of space and time GB3102.1-1993 Standard download and decompression password: www.bzxz.net

Introduction
National Standard of the People's Republic of China
Quantities and units-Space and timeGB 3102. 1—93
Replaces GB3102.1- 86
This standard is equivalent to the international standard ISO31-1:1992 "Quantities and Units - Part: Space and Time". This standard is one of a series of national standards related to quantities and units that have been formulated. This series of national standards are: GB3100 International System of Units and their Applications:
GB3101 General Principles of Quantities, Units and Symbols; GB3102.1 Quantities and units of space and time; GB3102.2 Quantities and units of cycles and related phenomena: GB3102.3 Quantities and units of mechanics;
GB3102.4 Quantities and units of heat; || tt||GB3102.5 Quantities and units of electricity and magnetism; GB3102.6 Quantities and units of light and related electromagnetic radiation; GB3102.7 Quantities and units of acoustics;
GB3102.8 Physical chemistry and molecular physics Quantities and units of science; Quantities and units of atomic physics and nuclear physics, GB 3102.9
GB3102.10
GB 3102.11
GB3102.12
Nuclear reactions and Quantities and units of ionizing radiation: mathematical symbols used in physical science and technology; characteristic numbers;
GB3102.13 Quantities and units of solid state physics. The above-mentioned national standards implement the "Measurement Law of the People's Republic of China", the Standardization Law of the People's Republic of China, and the "Order on the Unified Implementation of Legal Units of Measurement in my country and the Legal Units of Measurement of the People's Republic of China" promulgated by the State Council on February 27, 1984. The main content of this standard is listed in the form of a table. The relevant columns of the table are listed on the left pages, and their units are listed on the corresponding right pages and aligned. All units between the two solid lines are on the left. The tables of quantities between corresponding solid lines on each page list the most important quantities and their symbols in the field of this standard, and in most cases give definitions of the quantities, but these definitions are for identification purposes only. Not all are complete. The quantification properties of some quantities are indicated, especially when definitions require it, but no attempt is made to make them complete or consistent. In most cases, only a name is given for each quantity. A symbol. When two or more names or symbols are given to a quantity without distinction, they are of equal status when two italicized letters (for example: 9, 39, 9, g) are present. When only one of these is given, this does not mean that the other is not equally applicable. In general such variants should not be given a different meaning as "alternate symbols" for the primary symbol in a particular case. When used with different meanings, the corresponding units of the quantity are listed together with their international symbols and definitions. The units are arranged in the following manner:
Generally only SI units and their prefixes should be used. Decimal multiples and fractional units. Decimal multiples and fractional units approved by the State Administration of Technical Supervision on 1993-12-27
implemented on 1994-07-01
units are not clearly given. |GB 3102.1—93
Non-SI units that can be used together with SI units and are national legal measurement units are listed under SI units and are separated from the corresponding SI units used in specialized fields by a dotted line. Non-national legal units of measurement are listed in the "Conversion Factors and Remarks" column. Some non-national legal units of measurement are listed in the appendix (reference parts). These reference parts are not part of the standard. Description of units for quantities in dimension one: | |tt||The consistent unit for any quantity of dimension one is the number one (1). When expressing the value of such a quantity, the unit 1 is generally not explicitly written out. Decimal multiple or fractional unit. The prefix can be replaced by a power of 10. Example:
Refractive index n=1.53×1=1.53||Reynolds number Re=1.32×10
Consider. Generally, the plane angle is expressed as the ratio of two lengths, and the solid angle is expressed as the ratio of the area to the square of the length. The International Committee on Weights and Measures (CIPM) stipulated in 1980 that radian and steradian are independent in the International System of Units. The derived unit of , which means that if plane angle and solid angle are used as dimensionless derived quantities, in order to facilitate the identification of quantities with the same dimensions but different properties, the units radian and steradian can be used in the expression of the derived unit. tt||Numeric representation:
All values ??in the "Definition" column are accurate. If the value in the "Conversion Factor and Remarks" column is accurate, add the words "accurate value" in brackets after the value. Special instructions for this standard:
Appendices A, B and C are reference parts , the units listed are non-statutory units of measurement, the units in Appendix A and B are restricted units, and the units in Appendix C are abolished units
This standard stipulates. The names and symbols of quantities and units of space and time are given; when appropriate, conversion factors are given. 2 Names and symbols
61
item|| tt||1-1
1-2
Quantity: 1-1~1-3. 10
Good
1-3. 1||tt| |1-3.2
1-3.3
1-3.4
1-3.5
1-3.6
1-3.7
1 -3.8
1-3.9
1-3.10
62
name of quantity
[plane angle
angle,||tt ||(plane angle)
solid angle
solid angle
length
length
width
breadth
height
height
thickness
thickness
radius
radius
true diameter
diameter
length
length of path
distance
distance
Cartesian coordinates
cartesian
coordinates
radius of curvature|| tt||radius of
curvature
symbol
α.B,r,ep
t,L
6
h| |tt||d,e
r,R
d,D
s
dr
I,y,2
p
GB 3102.1—93
Definition
Definition
The plane angle is the lone length of a circle with the intersection point of two rays as the center
intercepted by a ray The ratio to the radius
The solid angle of the cone is, taking the term
point of the cone as the center of the sphere to make a spherical surface, the ratio of the area intercepted by the cone on the surface of the sphere to the square of the radius of the sphere is | |tt||Note
Other symbols may also be used
The length is one of the basic quantities
Term
No.
1-1.a||tt ||1-1.b
1-1.c
1-1.d
1-2.a
1-3.a||tt ||1-3.b
Unit name
radians
radian
degrees
degree
[angle] minutes||tt ||minute
[angular] seconds
second
steradian
steradian
meter
tmetre
nautical mile| |tt||nautical mile
symbol
rad
sr
m
n mile
GB 3102. 1—93|| tt||Definition
Definition
1rad=1m/m=1
to
180rad
1'=(1/60)||tt ||1\=(1/60)
1 sr-1 m*/m2=1
Meter is light in vacuum
Unit: 1-1.a~1-3.b
Conversion factors and remarks
See introduction.
The radian is the
plane angle between two radii in a circle. The arc length intercepted by these two radii on the circumference is equal to the radius
1°=0.0174533rad| |tt|| There should be no space between a number and any such single-digit
symbol of the subscript type.
Degrees are best subdivided into decimal units; therefore, the unit symbol should come after the number.
Example: 17°15° is best written as 17.25°
See the introduction.
The steradian is a solid angle whose vertex is
at the center of the sphere, and the area it intercepts on the sphere is equal to the area of ??the square with the radius of the sphere as the side length
Angstroms ( A),
(1/299792458) 5 time
1A=10-\m (accurate value)
The length of the path within the interval
Commonly known as kilometers Kilometer
1 n mile=1 852 m (accurate value)
(only used for voyage)
This definition was adopted by the 1929 International Hydrology
Conference| |tt||63
Item
14
Quantity: 1-4～1-9
No.
1-5
1-6
1-7
1-8
1-9
64
name of quantity
curvature||tt ||curvature
area
area
volume
volume
time
time
time interval||tt| |time interval.
Duration
duration
Angular velocity
angular velocity
Angular acceleration
angular
acceleration| |tt||symbol
A,(S)
V
GB 3102.1—93
definite
=1/p
drdy
meaning
where the sum is the Cartesian coordinate
de dy da
where the sum is the Cartesian coordinate
d|| tt||d
da
dt
da
Preparation
Note
For area elements, sometimes
For volume elements, sometimes
d
time is one of the basic quantities
. This equation is applicable to rotation around a fixed
fixed axis. If and
α are both regarded as vector
quantities, they can also generally use
with the
term
sign ||tt| |1-4.a
1-5.a
1-5.b
1-6.a
1-6.b||tt| |1-7.a
1-7.b
1-7.c
1-7.d
1-8.a||tt| |1-9.a
Unit name
per meter
reciprocal
metre,
negative cubic meter
metre to the
power minus one
square meter
square meter
public term
hectare
cubic meter
cubic meter| |tt||liter
litre
second
second
minute
minute
[hour]
hour
Day, (day)
day
radian per second
radian per
second
radian per quadratic second|| tt||radian per
second squared
symbol
m~
m
hm?
m
1 ,L
s
min
h
d
rad/s
rad/s\
GB 3102 . 1--93
definite
111dm
meaning
second is one of the two hyperfine energy levels of the -133 atomic base
state|| The duration of
9192631770 cycles
of the radiation corresponding to the intercalation migration between tt||
1 min=60 s
1h=60min
1 d=24 h
Unit: 1-4.a~1-9.a
Conversion factor and remarks
Used to express land area
1hm=10 *m (accurate value)
The symbol for cubic centimeters is crn2 instead of
cc
11=10-3m* (accurate value)
1964 The definition of the 12th International Planning and Fireworks Conference
was upgraded to 11=1dm. According to the old definition of
, rising is equal to 1.000028dm
For the time representation of day, please refer to
GB2809.
Other units, such as weeks, months and years
(a) is the commonly used unit
For other units, please refer to 1-1,b~~d
Other units Refer to 1-1.b~~d
65
Item
Quantity: 1-10~1-11.2
No.
1-10| |tt||1-11.1
Name of quantity
Speed
velocity
Acceleration
acceleration
1-11.2|Free fall Acceleration
acceleration of
free fall
acceleration of gravity
acceleration due
to gravity
66
symbol|| tt||c
U
o
GB 3102. 1--93
definite
dt
4||tt| |dt
meaning
preparation
note
v is a broad sign. c Use
as the propagation speed of the wave.
When vector signs are not used,
is recommended to use u, U, w as components of velocity c

This equation is suitable for straight-line motion
motion .If a and v are variables,
it also applies generally
standard free fall acceleration
degree:
g. = 9.806 65 m/s2||tt ||(Exact value)
(Third International Congress of Weights and Measures,
1901)
Item number
1-10.a
1 -10.b
1-10.c
Unit name
meters per second
metre per
second
kilometers per [Small] hour
kilometre per
hour
knot
knot
1-11.a meter per square second
metre per
second squared
symbol
m/s
km/h
kn
m/s2bzxz.net
GB 3102.1--93
Definition
Definition
Unit: 1-10.a~1-11.a
Conversion factors and remarks
m /s (accurate value) =
1
1 km/h=
3.6
0.277778m/s
1kn=1nmile/h|| tt||0.514444m/s (only for navigation)
67
Quantity item number
1-3.1
1-5
68||tt| |Name of quantity
Length
length
Area
area
GB 3102.1—93
Appendix A
Units based on feet, pounds and seconds and certain other units (reference piece)
Unit item number
1-3.Aa
1-3.Ab||tt| |1-3.Ac
1-3-Ad
1-5.Aa
1-5.Ab
1-5.Ac||tt| |Unit name
with symbol
inch
inch:
in
feet
foot:
ft|| tt||yard
yard
yd
mile
mile
square inch
square inch:
in?
square foot
square foot:
ft*
square yard
square yard
yd2
Conversion factor sum Notes
1in=25.4mm (accurate value)
The name mil or thou is sometimes used to represent "milliinches"
1ft=12in (accurate value) ) = 0.3048m (accurate value) The American surveying foot used for marine and geodetic surveys in the United States is defined as:
1 US surveying foot
_1200
3937
m= 1. 000 002×
0. 304 8 m=0.304 800 6 m
1yd=3ft (accurate value)=36 in (accurate value) 0.9144m (accurate value)
This definition was legally adopted by the United States in 1959 (Announcement U.S. Dept. of Commerce, National Bureau of Standards, FRDoc. 59-5442 dd June 30, 1959) and the United Kingdom in 1963 (Weights and Measure Act, 1963). For exceptions to U.S. surveying feet, see 1-3. Ab's notes
1mile=5280ft (accurate value) m
1609.344m (accurate value)
The mile here is also called the legal English one.
1 US mile=1609.347m
1in=645.16mm (accurate value)
Sometimes "circular mils" are used to express area:
×10-* in* =506. 707 5 μm2
1ft*=0.09290304m2 (accurate value)
1yd2=0.83612736m (accurate value)
Usually use \sq in\,\sgft\ and\ sq yd” is the English abbreviation symbol
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