Prefix
Name | Symbol | $10^n$ |
---|---|---|
kilo | k | $10^3$ |
hecto | h | $10^2$ |
deca | da | $10^1$ |
  |   | $10^0$ |
deci | d | $10^{-1}$ |
centi | c | $10^{-2}$ |
Pressure
\begin{align}
1 \mathrm{\,Pa}&=1 \mathrm{\,N/m^2}\\
\text{Atmospheric pressure}&=1013.25 \mathrm{\,hPa}= 0.101325\mathrm{\,MPa}
\end{align}
Others
Density of water:
$$\rho \sim 1 \mathrm{\,g/cm^3}=1000 \mathrm{\,kg/m^3}$$
Water pressure:
Let gravitational acceleration be $g\sim 10 \mathrm{\,m/s^2}$.
According to above calculation, water pressure at a depth of 1m is
$$10^4 \mathrm{\,(kg\cdot m/s^2)/m^2}=10^4\mathrm{\,N/m^2}=10\mathrm{\,k Pa}.$$