Caring about when concentrations match is like caring about the brakes on your car. You do not think about it every day, but it is literally keeping you alive.
When The Concentration Of Two Solutions Is The Same | Detroit Chinatown
Your kidneys are champion concentration-balancers. They work all day to make sure your blood isn’t too watery or too syrupy. If they fail, you get sick.
If you are gardening, you need the concentration of fertilizer in the water to match what the plant roots can handle. Too strong, and you burn the roots. Too weak, and the plant starves. It is all about balance.
The Cookie Science
Have you ever baked cookies that spread out into a flat, sad pancake? The sugar concentration was too high relative to the flour. The sugar melted and spread before the cookie could set.
A good cookie recipe is a careful dance of concentrations. The butter, sugar, and flour are three different solutions in a way. They must be in harmony.
When you get a perfectly chewy cookie, you are tasting equilibrium. You are tasting the sweet spot where the concentration of butter equals the concentration of sugar. Pure magic.