How to see the size and free disk space on the / filesystem's partition? [closed]

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http://askubuntu.com – Possible Duplicate: How do I find the amount of free space on my hard drive? In Nautilus, I can easily see the physical size (total capacity, free space, used space) of any mounted disk, e.g. those mounted under /media, by right-clicking on them where they are listed on the top of the left panel (with a disk icon), or even by right-clicking on their folder icon on the right when I'm seeing the contents of folder that contains them (e.g. /media). But I can't do that with the partition that contains the root filesystem. How can I see the physical properties of the disk partition that (HowTos)