Q meaning in Space Science ?
Answer: What is Dynamic Pressure mean?
In incompressible fluid dynamics dynamic pressure (indicated with q {\displaystyle q} , or Q, and sometimes called velocity pressure) is the quantity defined by:
q = 1 2 ρ u 2 {\displaystyle q={\frac {1}{2}}\rho \,u^{2}}where (using SI units):
It can be thought of as the fluid's kinetic energy per unit volume.
For incompressible flow, the dynamic pressure of a fluid is the difference between its total pressure and static pressure. From Bernoulli's law, dynamic pressure is given by
p 0 − p s = 1 2 ρ u 2 {\displaystyle p_{0}-p_{\text{s}}={\frac {1}{2}}\rho \,u^{2}}where p 0 {\displaystyle p_{0}} and p s {\displaystyle p_{\text{s}}} are the total and static pressures, respectively.
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