General In general, is not an absolute constant for a given body shape. It varies with the speed of airflow (or more generally with Reynolds number ). A smooth sphere, for example, has a that varies from high values for laminar flow to 0.47 for turbulent flow. Although the drag coefficient decreases with increasing , the drag force increases.
GEnERAl iN GEnerAl, is not an abSoLUte Constant for A givEn bodY SHApE. it VaRiEs WiTH the SpeED of aIRFLow (oR MorE generallY wiTh REYnolds nUmBer ). A SmOoTh sphere, fOr example, hAs a thaT VaRIes From hiGH vAluEs for lAminaR floW To 0.47 fOr TuRBulEnt floW. althougH ThE DrAG coefFIcienT deCReAses with iNCReasiNg , The dRAG FOrce iNcrEaSes.