Suraj se suraksha ke liye topi aur chhatri? Vigyan

UV prabhav, chhaya aur vyavaharik suraj suraksha upayon par vaigyanik nazariya. Video janch karta hai ki kya topi ya chhatri sunscreen ki jagah le sakte hain aur dopahar ke avkash aur uchch UV ghanton ke dauran suraksha ke bare me margdarshan deta hai. Thailand me tez dhoop ke dauron me suvidha aur twacha suraksha ki yojana banane me upyogi.