What are the main methods for strengthening the mechanical properties of metal materials and the meaning of one of them

What are the main methods for strengthening the mechanical properties of metal materials and the meaning of one of them

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At T °C,2 g of crystals were precipitated by evaporating 10 g of water from 105 g of potassium nitrate solution. At t°C, after evaporating 10 g of water from 105 g of potassium nitrate solution,2 g of crystals are precipitated; if evaporating 12 g of water from 105 g of the original solution,3 g of crystals are precipitated at the same temperature, the mass of potassium nitrate in the original solution is () g, and the mass fraction of the crystallized solution is () g. At T °C,2 g of crystals were precipitated by evaporating 10 g of water from 105 g of potassium nitrate solution. At t°C, after evaporating 10 g of water from 105 g of potassium nitrate solution,2 g of crystals are precipitated; if evaporating 12 g of water from 105 g of original solution,3 g of crystals are precipitated at the same temperature, the mass of potassium nitrate in the original solution is () g, and the mass fraction of solution after crystallization is () g.

Evaporation of 12 g of water indicates saturation
So 2 g of water versus 1 g of potassium nitrate
So 33 grams of potassium nitrate
Water 72 g