Is Matter Around Us Pure?

Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statutes that might otherwise be infringing. Non-profit, educational, or personal use tips the balance in favor of fair use. What Is a Pure Substance? Daily life mein hum pure water, pure milk aur pure honey jaise words sunte hain. Lekin science mein pure substance ka meaning thoda different hota hai. Science ke according, ek pure substance woh hota hai jo sirf ek type ke particles se bana ho aur jiski composition fixed ho. Examples hain pure gold, oxygen aur distilled water. Lekin jo substances hum daily life mein use karte hain, unmein se bahut saare mixtures hote hain. For example, air mein oxygen, nitrogen aur other gases present hoti hain. Tap water mein water ke saath dissolved salts aur gases bhi ho sakti hain. Isliye har substance jo clean dikhta hai, zaroori nahi ki scientifically pure bhi ho. What Is a Mixture? Jab do ya do se zyada substances physically combine hote hain, toh mixture form ho sakta hai. For example, salt water mein salt aur water combine hote hain. Air bhi different gases ka mixture hai. Mixture ki sabse important baat ye hai ki uske components apni individual properties largely retain karte hain aur suitable physical methods se separate kiye ja sakte hain. Mixtures ke do main types hote hain: Homogeneous mixture aur heterogeneous mixture. Homogeneous Mixture Homogeneous mixture mein composition uniformly distributed hoti hai. Matlab mixture ke different parts mein composition same hoti hai. For example, agar salt ko water mein completely dissolve kar diya jaye, toh properly mixed salt solution homogeneous mixture ban jata hai. Sugar solution aur air bhi homogeneous mixtures ke examples hain.