Why sound wave is called a longitudinal wave?
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Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.
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Sᴏᴜɴᴅ ᴡᴀᴠᴇs ɪɴ ᴀɪʀ (ᴀɴᴅ ᴀɴʏ ғʟᴜɪᴅ ᴍᴇᴅɪᴜᴍ) ᴀʀᴇ ʟᴏɴɢɪᴛᴜᴅɪɴᴀʟ ᴡᴀᴠᴇs ʙᴇᴄᴀᴜsᴇ ᴘᴀʀᴛɪᴄʟᴇs ᴏғ ᴛʜᴇ ᴍᴇᴅɪᴜᴍ ᴛʜʀᴏᴜɢʜ ᴡʜɪᴄʜ ᴛʜᴇ sᴏᴜɴᴅ ɪs ᴛʀᴀɴsᴘᴏʀᴛᴇᴅ ᴠɪʙʀᴀᴛᴇ ᴘᴀʀᴀʟʟᴇʟ ᴛᴏ ᴛʜᴇ ᴅɪʀᴇᴄᴛɪᴏɴ ᴛʜᴀᴛ ᴛʜᴇ sᴏᴜɴᴅ ᴡᴀᴠᴇ ᴍᴏᴠᴇs.
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