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A sample of any of the following substances disappears after sometime when exposed to air like camphor, naphthalene or dry ice. This phenomenon is called निम्नलिखित में से किसी वस्तु के नमूने को हवा में खुला रखने पर कुछ समय पश्चात्‌ गायब हो जाता है जैसे कपूर‚ नैफ्थलीन अथवा शुष्क बर्फ। इस परिघाटना को कहते हैं

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A sample of any of the following substances disappears after sometime when exposed to air like camphor, naphthalene or dry ice. This phenomenon is called निम्नलिखित में से किसी वस्तु के नमूने को हवा में खुला रखने पर कुछ समय पश्चात्‌ गायब हो जाता है जैसे कपूर‚ नैफ्थलीन अथवा शुष्क बर्फ। इस परिघाटना को कहते हैं






 
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