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Force dimensions are '''M'''<sup>1</sup> '''L'''<sup>1</sup> '''T'''<sup>−2</sup> , momentum has dimensions '''M'''<sup>1</sup>'''L'''<sup>1</sup> '''T'''<sup>−1</sup> and rate of change of momentum has dimensions '''M'''<sup>1</sup> '''L'''<sup>1</sup>'''T'''<sup>−2</sup>, ie the same as force. Work and energy are similar quantities with dimensions '''M'''<sup>1</sup> '''L'''<sup>2</sup>'''T'''<sup>−2</sup>. Power has dimensions '''M'''<sup>1</sup> '''L'''<sup>2</sup>'''T'''<sup>−3</sup>.<ref>https://archive.org/details/masslengthtime0000norm_v5r2/page/150/mode/2up, Mass, Length and Time, Norman Feather 1959, p. 150</ref>
== Influence of Altitude on Jet Engine Performance ==
Jet engine performance is significantly influenced by altitude, primarily due to changes in air density and temperature. As an aircraft ascends, the air becomes less dense, which can lead to a decrease in engine thrust. For example, at higher altitudes, engines may produce less thrust because there is less oxygen available for combustion. This phenomenon is particularly critical during takeoff and climb phases, where maximum thrust is essential for overcoming gravitational forces. To mitigate these effects, modern jet engines are designed with variable geometry components that optimize airflow and maintain performance across a range of altitudes
==References==
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