You compare how the rate changes when concentrations change. If doubling one reactant doubles the rate, it's first order with respect to that. For me, it's like watching the morning mist lift from the valley—the pattern reveals itself if you observe the changes quietly. My *ghar ka aangan* is my lab; I've plotted enough graphs on my old notebook, with the *pahari hawa* for company, to see the order in the numbers.
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