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<p>very high (<a href="page.php?w=supersonic">supersonic</a>) speed, and the reaction to this pushes the vehicle (<a href="page.php?w=rocket">rocket</a>) in the opposite direction. Combustion is most frequently used for practical rockets, as the laws of <a href="page.php?w=thermodynamics">thermodynamics</a> (more specifically <a href="page.php?w=Carnot%27s_theorem_%28thermodynamics%29">Carnot's theorem</a>) dictate that high temperatures and pressures are desirable for the best <a href="page.php?w=thermal_efficiency">thermal efficiency</a>. <a href="page.php?w=Nuclear_thermal_rocket">Nuclear thermal rocket</a>s</p><p>
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