忽略数量级排序
常见常数
[atm = 1.01325 imes 10^2 kPa = 760mmHg\
ln3 = 1.10\
E_1 = -1.36 imes 10^1 eV\
sqrt2 = 1.414\
e = 1.60 imes 10^{-19} C\
ln5 = 1.61\
m_p = 1.67 imes 10^{-27}kg\
sqrt3 = 1.732\
sqrtpi = 1.77\
ln7 = 1.95\
e^3 = 2.01 imes 10^1\
sqrt5 = 2.24\
sqrt7 = 2.65\
e = 2.72\
0K = -2.73 imes 10^2 ℃\
c = 2.99792458 m/s\
pi = 3.14\
frac{1}{pi} = 3.18 imes 10^{-1}\
frac{1}{e} = 3.68 imes 10^{-1}\
C_{H_2O} = 4.2 imes 10^3 J/(kg·℃)\
r_1 = 5.29 imes 10^{-11} m\
t_P = 5.39 imes 10^{-44} s\
N_A = 6.02 imes 10^{23} mol^{-1}\
h = 6.63 imes 10^{-34} J·s\
G = 6.67 imes 10^{-11} N·m^2/kg^2\
G = 6.67 imes 10^{-11} m^3/(kg·s^2)\
ln2 = 6.93\
e^2 = 7.39\
epsilon_0 = 8.85 imes 10^{-12} F/m\
k = 8.99 imes 10^9 N·m^2/C^2\
m_e = 9.11 imes 10^{-31} kg\
1u = 9.315 imes 10^2 MeV\
g_{赤道} = 9.780 m/s^2\
g_{北京} = 9.801 m/s^2\
g_{北极} = 9.832 m/s^2\
pi^2 = 9.87\
]
其它常数
[ ext{可见光400nm(紫)~780nm(红)}\
ext{可识别声音20Hz~20000Hz}\
电子的波长 8.7 imes 10^{-11} m ，以 8.39 imes 10^6 m/s 的速度产生的德布罗意波。\
网球的波长 7 imes 10^{-34} m ，重 57g 的网球以 60 km/h 的速度产生的德布罗意波。\
宇宙微波背景辐射温度 2.7 K\
哈勃常数 67.80±0.77(km/s)/Mpc\
地球半径6371Km，地球质量5.97×10^24Kg\
第一宇宙速度 7.9 km/s\
第二宇宙速度 11.2 km/s\
第三宇宙速度 16.7 km/s\
精细结构常数 frac{1}{alpha}=137\
pi^2 approx g
]
必备常数
[atm = 101 kPa\
ln3 = 1.10\
E_1 = -13.6 eV\
sqrt2 = 1.414\
e = 1.60 imes 10^{-19} C\
ln5 = 1.61\
m_p = 1.67 imes 10^{-27}kg\
sqrt3 = 1.732\
e^3 = 20.1\
sqrt5 = 2.24\
sqrt7 = 2.65\
e = 2.71828\
0K = -273.15℃\
c = 3.00 imes 10^8 m/s\
pi = 3.14159\
frac{1}{e} = 0.368\
r_1 = 5.29 imes 10^{-11} m\
N_A = 6.02 imes 10^{23} mol^{-1}\
h = 6.63 imes 10^{-34} J·s\
G = 6.67 imes 10^{-11} N·m^2/kg^2\
ln2 = 0.693\
e^2 = 7.39\
k = 8.99 imes 10^9 N·m^2/C^2\
1u = 931.5 MeV\
g_{赤道} = 9.78 m/s^2\
]