Video narration
10 gram chini ar 90 gram jol mishale, ei mishron ki 10% chini, naki jolke dhore onno kichu hishab korte hobe? Lemonade bananor moto bhabo: chini holo solute, je podarthoti gole jay; jol holo solvent, jar modhye ta gole. Meshandar pore solution-e dutoi thake, karon puro mishrontai hishaber ongsho. Oneke bhul kore 10 gram chinike 90 gram jol diye bhag koren. Kintu w/w mane weight by weight, ar ekhane ashol palabadolta holo, hor hobe joler bhor noy, puro solution-er bhor. Tai mot solution-er bhor = solute-er bhor + solvent-er bhor = 10 + 90 = 100 gram. Ekhon sutroti bolche: w/w% = (mass of solute / mass of solution) x 100. Orthat, 10 gram chinike 100 gram solution diye bhag kore 100 diye gun kori. Fol 10%. Mane, proti 100 gram solution-e 10 gram chini ache. Hya, eti 10% w/w, karon 100 gram mot solution-er modhye 10 gram chini.