Reversible change kya hai?

Badlaav reversible hai agar cheez ya padaarth ko waapas shuru waale roop mein laaya ja sake. Pighli baraf phir jamaai ja sakti hai, bhaap ko phir paani banaaya ja sakta hai, aur moda hua kaagaz khola ja sakta hai. Kai physical changes, khaaskar avastha ke badlaav, reversible hote hain.

Kya chemical changes reversible hote hain?

Roz ki zindagi mein aam taur pe nahi. Lakdi jalna, khaana pakna, doodh ka dahi banna, phal ka pakna aur jang lagna naye padaarth banaate hain, aur hum unhe aasaani se shuru waali cheez mein nahi badal sakte. Par har irreversible badlaav chemical nahi hota: sabzi kaatna physical change hai, phir bhi tukde waapas nahi judte.

Weathering aur erosion mein kya fark hai?

Weathering chattaanon ko todti hai, garmi-thand, badhti jadon aur jamte paani jaise physical badlaavon se, aur paani aur hawa se hone waale chemical badlaavon se. Erosion toote hue maal, yaani mitti, ret aur kankad, ko hawa aur behte paani se ek jagah se doosri jagah le jaata hai. Dono bahut dheeme hain aur mitti aur nayi chattaanein banaate hain.

Reversible aur irreversible changes kya hain?

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Kya hum use waapas pa sakte hain?

Koi cheez badal jaaye, to kya vo apne asli roop mein laut sakti hai? Activity 5.8 mein tum chapter ke har badlaav ko phir se dekhte ho aur Table 5.2 mein likhte ho ki asli cheez ya padaarth waapas mil sakta hai ya nahi. Baraf ke tukde pighalna: haan. Sabzi kaatna: nahi. Paani ubaalna: haan. Makke se popcorn banana: nahi.

Ulte ho sakne waale badlaav

Agar hum us cheez ya padaarth tak laut sakein jisse shuru kiya tha, to badlaav ulta ho sakta hai. Baraf pighle to paani ko phir jamaakar baraf bana sakte hain. Paani vaashp bane to vaashp ko thanda karke phir paani bana sakte hain. Moda hua kaagaz khul sakta hai, lapeti chatai phailaai ja sakti hai, aate ki chhoti goliyan phir ek saath goondhi ja sakti hain, aur aate se beli chapati, pakne se pehle, phir goli banaai ja sakti hai. Ghuli cheeni ya namak paani udne par waapas mil jaata hai.

Ulte na ho sakne waale badlaav

Kuch badlaav waapas nahi kiye ja sakte. Kati sabziyan apne size aur aakaar mein nahi laut saktin, aur popcorn phir makka nahi ban sakta. Jali lakdi raakh aur dhuaan chhodti hai, paka phal phir kachcha nahi hota, aur jang laga loha jang laga hi rehta hai. Isliye hum badlaavon ko do samoohon mein baant sakte hain: reversible aur irreversible. Roz ke zyaadatar chemical changes ulte nahi ho sakte, par kaagaz kaatna ya chalk peesna jaisa physical change bhi waapas nahi kiya ja sakta.

Chahe aur anchahe badlaav

Kai badlaav kaam ke hain. Doodh se dahi jamta hai, phal pakte hain, khaane ke liye phal kaatte hain aur khaana pakaate hain: ye chahe gaye badlaav hain. Kuch anchahe hain: lohe mein jang lagna, ya rakha hua khaana sadna. Jo badlaav ek sthiti mein anchaha hai, vo doosri mein chaha ja sakta hai: jo sadna rakha khaana kharaab karta hai, wahi khaane ke kachre ko paudhon ke liye compost banaata hai.

Insaanon ke kuch badlaav saalon mein jamaa hote hain aur lambe samay tak paryaavaran pe asar daalte hain. Car, train aur hawaai jahaaz mein badhta fuel hawa mein carbon dioxide badha raha hai, aur deewaaron, darwaazon aur furniture pe sookhta paint vaashp banke kai padaarth chhodta hai, jo hawa ko pradooshit karte hain.

Chahe gaye badlaav jaise dahi aur khaana pakna, anchahe jaise jang aur sadna, compost jaisa sthiti pe nirbhar badlaav, aur lambe asar waale badlaav — Chahe aur anchahe badlaav

Chattaanon ki weathering

Pahaadon ki talhati mein ret, mitti aur pattharon ke dher hote hain jinhe sediments kehte hain. Ye tab bante hain jab badi chattaanein physical badlaavon se chhote tukdon mein tootti hain: mausam ke saath taapmaan ka badalna, daraaron mein badhti jadein, aur daraaron ke andar jamta paani, sab chattaanein todte hain. Paani, ya paani mein ghule padaarth, chattaanon ke saath reaction karke unki banaawat bhi badal sakte hain. Kaali basalt chattaan, jismein loha hota hai, paani ya nam hawa mein lamba samay rehne par iron oxide ki laal parat bana leti hai. Ye physical aur chemical badlaav milkar weathering kehlaate hain, aur samay ke saath mitti banaate hain.

Garmi-thand, jadon aur baraf se physical weathering, aur basalt ko laal karne waali chemical weathering, jo chattaanon ko sediments aur phir mitti mein badalti hai — Weathering: chattaan se mitti

Erosion

Nadi ki tali aur jheel ke kinaaron ki baareek ret un kankadon, mitti aur sediments se aati hai jinhe hawa aur behta paani todkar nayi jagahon pe le jaate hain. Is prakriya ko erosion kehte hain, aur landslide ke dauraan erosion ek physical change hai. Nadi ke kankad chikne dikhte hain kyunki behta paani unhe lagaataar ghisata rehta hai. Jahan paani ya hawa dheemi hoti hai, jaise jheel ya samudra mein, wahan laaya gaya maal neeche baith jaata hai, aur samay ke saath ye sediments sakht hokar nayi chattaanein ban jaate hain. Aise badlaavon mein hazaaron saal lagte hain aur ye ulte nahi ho sakte.

Hawa aur nadi pahaadon se ret aur kankad le jaate hain; kankad chikne hote hain, aur jheel mein sediments paraton mein baithkar chattaan bante hain — Erosion: bah jaana

Ye kyun zaroori hai

Kaunse badlaav ulte ho sakte hain aur kaunse chahe gaye hain, ye jaanna khaana bachaakar rakhne, dhaatuon ko bachaane aur mitti aur pahaadi dhalaanon ki dekhbhaal mein madad karta hai. Badlaav ke do mukhya prakaar physical aur chemical changes mein hain, aur jalna combustion kya hai mein. Table 5.2 samet har activity aur sawaal ke jawaab Chapter 5 ke NCERT solutions mein hain; poore Chapter 5 ke notes bhi dekho.