What does a hydrometer contain?
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A hydrometer is an instrument used to measure the specific gravity (or relative density) of liquids; that is, the ratio of the density of the liquid to the density of water. A hydrometer is usually made of glass and consists of a cylindrical stem and a bulb weighted with mercury or lead shot to make it float upright.
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ᴀ ʜʏᴅʀᴏᴍᴇᴛᴇʀ ɪs ᴀɴ ɪɴsᴛʀᴜᴍᴇɴᴛ ᴜsᴇᴅ ᴛᴏ ᴍᴇᴀsᴜʀᴇ ᴛʜᴇ sᴘᴇᴄɪғɪᴄ ɢʀᴀᴠɪᴛʏ (ᴏʀ ʀᴇʟᴀᴛɪᴠᴇ ᴅᴇɴsɪᴛʏ) ᴏғ ʟɪǫᴜɪᴅs; ᴛʜᴀᴛ ɪs, ᴛʜᴇ ʀᴀᴛɪᴏ ᴏғ ᴛʜᴇ ᴅᴇɴsɪᴛʏ ᴏғ ᴛʜᴇ ʟɪǫᴜɪᴅ ᴛᴏ ᴛʜᴇ ᴅᴇɴsɪᴛʏ ᴏғ ᴡᴀᴛᴇʀ. ᴀ ʜʏᴅʀᴏᴍᴇᴛᴇʀ ɪs ᴜsᴜᴀʟʟʏ ᴍᴀᴅᴇ ᴏғ ɢʟᴀss ᴀɴᴅ ᴄᴏɴsɪsᴛs ᴏғ ᴀ ᴄʏʟɪɴᴅʀɪᴄᴀʟ sᴛᴇᴍ ᴀɴᴅ ᴀ ʙᴜʟʙ ᴡᴇɪɢʜᴛᴇᴅ ᴡɪᴛʜ ᴍᴇʀᴄᴜʀʏ ᴏʀ ʟᴇᴀᴅ sʜᴏᴛ ᴛᴏ ᴍᴀᴋᴇ ɪᴛ ғʟᴏᴀᴛ ᴜᴘʀɪɢʜᴛ.
ᴍᴀʀᴋ ᴍᴇ ᴀs ᴀ ʙʀᴀɪɴʟɪᴇsᴛ ᴘʟᴢ :)
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