Fire caused by petrol cannot be extinguished with water because:

Explanation / व्याख्या

Fire caused by petrol cannot be extinguished with water because petrol is lighter than water and does not mix with it. Instead, petrol floats on top of water and spreads, which can actually increase the fire area instead of putting it out.

पेट्रोल में लगी आग को पानी से इसलिए नहीं बुझाया जा सकता क्योंकि पेट्रोल पानी से हल्का होता है और उसमें घुलता नहीं है। यह पानी की सतह पर तैरता है और फैल जाता है, जिससे आग और भी बढ़ सकती है।

 Key Facts / महत्वपूर्ण तथ्य

• ⛽ Petrol is immiscible with water (पानी में नहीं घुलता)
• 🌊 Petrol has lower density than water, so it floats
• 🔥 Water can spread burning fuel instead of cooling it
• 🧯 Hence, foam or CO₂ fire extinguishers are used for petrol fires

❌ Why others are incorrect / अन्य विकल्प गलत क्यों हैं

• Water decomposes due to heat: Not relevant in normal fire situations
• Both are liquids: Does not explain extinguishing failure
• Water is heavier: True, but this is not the main reason without understanding immiscibility

Simple trick / याद रखने का तरीका

👉 “Petrol floats → Fire spreads → Water is useless”