Mientras más rápido es el flujo, mayor es la fricción.

Questions & Answers about Mientras más rápido es el flujo, mayor es la fricción.

How do you say "The [more]..., the [more]..." in Spanish? I don't see a word for "the" at the beginning of the sentence.
In English, we use "The [comparative]..., the [comparative]...". Spanish doesn't use the definite article (el or la) for this. Instead, it uses correlative structures like mientras más... más... or cuanto más... más.... Here, the second half uses mayor (greater) instead of más, giving us mientras más... mayor....
I previously learned to use cuanto más for this type of sentence. Is mientras más different?
They mean the exact same thing in this context. Mientras más is very common in Latin America, while cuanto más is traditionally preferred in Spain. As a learner focusing on Latin American Spanish, you will hear mientras más (and mientras menos) frequently.
Why is the subject el flujo placed after the verb es in the first clause?
In these correlative comparative structures, it is standard to invert the subject and the verb. You put the comparative phrase first (mientras más rápido), then the verb (es), and finally the subject (el flujo). Saying mientras más rápido el flujo es would sound unnatural to a native speaker.
Could I say más grande instead of mayor for "the greater"?
You would be understood, but mayor is much more natural here. While más grande usually refers to physical size, mayor is used to describe a higher degree, intensity, or amount. Since friction is higher in intensity rather than physically "big", mayor is the right choice.

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