कोयला : फूलदेव सहाय वर्मा द्वारा हिंदी पीडीऍफ़ पुस्तक – सामाजिक | Koyala : by Phooldev Sahay Verma Hindi PDF Book – Social (Samajik)
Pustak Ka Vivaran : Buri Avanchchhit Gaison ke Avashoshan ke liye Lakadi ka koyala bahut kargar Siddh huya hai. Aspatalon aur any aise Sthalon mein baltiyon ya Tokariyon mein yah koyala buri Gaison ke avashoshan ke liye sthan-sthan par rakha rahata hai. Yuddhagaison aur ashrugaison ka avashoshan bhee Nariyal ke chhilake ke koyale se bahut adhik hota huya Paya gaya hai. Masko mein Nariyal……….
Description about eBook : Charcoal has proved to be very effective for the absorption of bad undesired gases. In the buckets or baskets in hospitals and other such places, this coal is kept in place for absorption of bad gases. Absorption of warguards and lacrimal gases has also been found to be much higher than coal from coconut shells. Coconut in Moscow………..
