When differential equations are being developed, what dictates the order of the differential? What decides if it is second order, third order, fourth order, fifth order, etc...(adsbygoogle = window.adsbygoogle || []).push({});

I understand that the process is taking the derivative of a derivative of a derivative, but what decides if the the third, fourth, or fifth derivative has any value when performing the analysis of process being investigated?

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# How are differential equations developed

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