define latent heat of a substance
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ʟᴀᴛᴇɴᴛ ʜᴇᴀᴛ, ᴇɴᴇʀɢʏ ᴀʙsᴏʀʙᴇᴅ ᴏʀ ʀᴇʟᴇᴀsᴇᴅ ʙʏ ᴀ sᴜʙsᴛᴀɴᴄᴇ ᴅᴜʀɪɴɢ ᴀ ᴄʜᴀɴɢᴇ ɪɴ ɪᴛs ᴘʜʏsɪᴄᴀʟ sᴛᴀᴛᴇ (ᴘʜᴀsᴇ) ᴛʜᴀᴛ ᴏᴄᴄᴜʀs ᴡɪᴛʜᴏᴜᴛ ᴄʜᴀɴɢɪɴɢ ɪᴛs ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ. ... ᴛʜᴇ ʟᴀᴛᴇɴᴛ ʜᴇᴀᴛ ɪs ɴᴏʀᴍᴀʟʟʏ ᴇxᴘʀᴇssᴇᴅ ᴀs ᴛʜᴇ ᴀᴍᴏᴜɴᴛ ᴏғ ʜᴇᴀᴛ (ɪɴ ᴜɴɪᴛs ᴏғ ᴊᴏᴜʟᴇs ᴏʀ ᴄᴀʟᴏʀɪᴇs) ᴘᴇʀ ᴍᴏʟᴇ ᴏʀ ᴜɴɪᴛ ᴍᴀss ᴏғ ᴛʜᴇ sᴜʙsᴛᴀɴᴄᴇ ᴜɴᴅᴇʀɢᴏɪɴɢ ᴀ ᴄʜᴀɴɢᴇ ᴏғ sᴛᴀᴛᴇ.
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Latent Heat Defined. ... In general the amount of heat required by unit mass of thesubstance to change its phase at constant temperature and pressure is called as latent heat of the substance.
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