Phase Diagrams: The Lever Rule {Texas A&M: Intro to Materials} 

I swear, Americans are so intelligent. literally they come up first in any academia search related results.

I realize it's pretty randomly asking but do anyone know a good website to stream newly released tv shows online ?

question 1: The system composition is the weight/mole fraction of B in the system as a whole without consideration of what phase it's in. Assuming we're talking about weight fraction that means if you were to weigh out the total amount of pure B and divide it by the total amount of material, you would get 0.40 or 40%. Let's say you mixed 80 grams of B and 120 grams of A. The system composition of B would be found by 80g/(80g + 120g) = 0.40. question 2: The 50% and 30% don't refer to the fraction of liquid and solid present. They refer to the composition of those individual phases. It means that if we were to take the solid phase out and ONLY look at the liquid phase, it would have a composition or 0.50 or 50% B. The rest of the liquid phase is 50% A. If we were to take the liquid phase out and ONLY look at the solid phase, it would have a composition of 0.30 or 30% B. The rest of the solid phase is 70% A. The liquid phase is relatively rich in B when compared to the solid phase. You can use this to figure out what fraction is liquid and what fraction is solid, but that's not what those percentages mean in the video. You have to solve a system of two equations: 1) [weight fraction of B in liquid phase (0.50)]*[mass of liquid phase] + [weight fraction of B in solid phase (0.30)]*[mass of solid phase] = [mass of B (80g)] 2) [mass of liquid phase] + [mass of solid phase] = [total mass (200g)] Solve for [mass of solid phase] or liquid. Doesn't matter which and the other answer is trivial.

@@HuggumsMcgehee Thank you for explaining it so well!

Thanks!@@HuggumsMcgehee

Sometimes, but is mostly a Texas A&M University tradition.

You are not right!!

He addresses this at 10:00.

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