what happenes to the ignition temperature of the combustible substance when we put water over it
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Water brings down the temperature of the combustible substance below its ignition temperature. The water vapour surrounds the combustible material, thus helping in cutting off the supply of air. So, that the fire is extinguished.
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Wᴀᴛᴇʀ ʙʀɪɴɢs ᴅᴏᴡɴ ᴛʜᴇ ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ ᴏғ ᴛʜᴇ ᴄᴏᴍʙᴜsᴛɪʙʟᴇ sᴜʙsᴛᴀɴᴄᴇ ʙᴇʟᴏᴡ ɪᴛs ɪɢɴɪᴛɪᴏɴ ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ. Tʜᴇ ᴡᴀᴛᴇʀ ᴠᴀᴘᴏᴜʀ sᴜʀʀᴏᴜɴᴅs ᴛʜᴇ ᴄᴏᴍʙᴜsᴛɪʙʟᴇ ᴍᴀᴛᴇʀɪᴀʟ, ᴛʜᴜs ʜᴇʟᴘɪɴɢ ɪɴ ᴄᴜᴛᴛɪɴɢ ᴏғғ ᴛʜᴇ sᴜᴘᴘʟʏ ᴏғ ᴀɪʀ. Sᴏ, ᴛʜᴀᴛ ᴛʜᴇ ғɪʀᴇ ɪs ᴇxᴛɪɴɢᴜɪsʜᴇᴅ.
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