13. Which is less dense?
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ᴀɴʏᴛʜɪɴɢ ᴛʜᴀᴛ ʜᴀs ᴀ ᴅᴇɴsɪᴛʏ ʟᴇss ᴛʜᴀɴ 1 ғʟᴏᴀᴛs. ᴀɴʏᴛʜɪɴɢ ᴛʜᴀᴛ ʜᴀs ᴀ ᴅᴇɴsɪᴛʏ ʜɪɢʜᴇʀ ᴛʜᴀɴ 1 sɪɴᴋs. ɪᴄᴇ ɪs ~12% ʟᴇss ᴅᴇɴsᴇ ᴛʜᴀɴ ᴡᴀᴛᴇʀ sᴏ ɪᴄᴇ ғʟᴏᴀᴛs. ᴡᴀᴛᴇʀ ɢᴇᴛs ʙɪɢɢᴇʀ ᴡʜᴇɴ ɪᴛ ғʀᴇᴇᴢᴇs sᴏ ɪᴄᴇ ɪs ʟᴇss ᴅᴇɴsᴇ ᴛʜᴀɴ ᴡᴀᴛᴇʀ.
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Anything that has a density less than 1 floats. Anything that has a density higher than 1 sinks. Ice is ~12% less dense than water so ice floats. Water gets bigger when it freezes so ice is less dense than water.
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