Mass, in physics, quantitative measure of inertia, a fundamental property of all matter. It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force. The greater the mass of a body, the smaller the change produced by an applied force.
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ᴍᴀss ɪs ᴀ ᴍᴇᴀsᴜʀᴇᴍᴇɴᴛ ᴏғ ʜᴏᴡ ᴍᴜᴄʜ ᴍᴀᴛᴛᴇʀ ɪs ɪɴ ᴀɴ ᴏʙᴊᴇᴄᴛ. ᴍᴀss ɪs ᴀ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴ ᴏғ ᴛʜᴇ ᴛᴏᴛᴀʟ ɴᴜᴍʙᴇʀ ᴏғ ᴀᴛᴏᴍs, ᴛʜᴇ ᴅᴇɴsɪᴛʏ ᴏғ ᴛʜᴇ ᴀᴛᴏᴍs, ᴀɴᴅ ᴛʜᴇ ᴛʏᴘᴇ ᴏғ ᴀᴛᴏᴍs ɪɴ ᴀɴ ᴏʙᴊᴇᴄᴛ. ʜᴏᴡ ᴛᴏ ᴍᴇᴀsᴜʀᴇ ᴍᴀss. ᴍᴀss ɪs ᴜsᴜᴀʟʟʏ ᴍᴇᴀsᴜʀᴇᴅ ɪɴ ᴋɪʟᴏɢʀᴀᴍs ᴡʜɪᴄʜ ɪs ᴀʙʙʀᴇᴠɪᴀᴛᴇᴅ ᴀs ᴋɢ.
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