ChemistrySurya · Class 2-3
Loha laal-bhoora kyun ho jaata hai?
Bahar pade-pade purani balti laal-bhoori kyun ho jaati hai?
Socho pehle… phir dekho jawab
Kyunki loha jab hawa (oxygen) aur paani dono se milta hai, toh ek nayi cheez banti hai — jang. Jang bhurbhuri hoti hai aur jhad jaati hai.
Tara ke dada baarish ke baad hamesha apni saikil sookhe kapde se poochhte hain aur chain par thoda tel lagate hain. Tara ne bhi yeh seekh liya. Dada ki saikil saalon se chamakti hai!
Kyun lagti hai jang? Loha hawa ki oxygen aur paani ke saath milkar ek nayi cheez bana deta hai — jang. Yeh laal-bhoori aur bhurbhuri hoti hai, aur dheere-dheere jhadti jaati hai.
Bachne ka tareeka: loha ko sookha rakho, ya usper rang ya tel ki parat lagao. Tab paani aur hawa seedhe loha tak nahi pahunch paate.
Ghar pe try karo
Bade ki madad se do katori lo. Ek mein ek purani loha ki keel rakhkar paani daalo, doosri katori mein ek sookhi keel rakho. Keel bade hi rakhein aur uthayein. 2-3 din baad dekho: kaun si keel par jang aayi? Dekh kar haath dho lo.
Wow!
Rang ya tel ki ek patli si parat bhi loha ko saalon tak jang se bacha sakti hai!
Mummy-Papa ke liye
Aaj bachche ke saath do katori wala prayog shuru kijiye (keel aap rakhein) aur 2-3 din baad saath mein dekhiye ki kya hua.
3 sawaal
- Jang kaisi hoti hai?
Jawab dekho
Laal-bhoori aur bhurbhuri. Jang laal-bhoori aur bhurbhuri hoti hai.
- Jang banne ke liye loha ko kya chahiye?
Jawab dekho
Hawa (oxygen) aur paani. Loha hawa ki oxygen aur paani se milkar jang banata hai.
- Loha ko jang se bachane ka ek tareeka kya hai?
Jawab dekho
Us par rang ya tel lagana. Rang ya tel paani aur hawa ko loha tak pahunchne se rokte hain.
NCERT se jodo: NCERT Class 2-3 EVS — hamare aas-paas ki cheezein aur unke badlav