Arrey, potato to wo medium hai jisme paani andar-bahar samaanta se aata-jata hai, isotonic point kehlata hai. Full marks ke liye simple diagram banao, clear lines se, aur seedha jawab likho na ki ghooma-fira ke. Maine school mein ye experiment bigaad diya tha... aaj kal jab loan ka chakkar samajhna padta hai, tab lagta hai isotonic point ki tarah, balance ki baat agar pehle seekh li hoti toh aaj itni mushkil nahi hoti.
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