RAM management works a bit differently on Android than
it does in Windows. For example, more RAM doesn’t mean wasted memory in
Android, but rather that applications are cached so that they can be
accessed more quickly at a later time. There are plenty of interesting
discussions on the topic, but that’s not the point of this article.
If you’ve ever tried to check the free RAM on your Android device, you probably used the free
command in Terminal Emulator. This works the same way as it does in
Linux, and it shows you both free and used memory. If you are using a
swapfile, it’s shown as well. But if you want to learn more about your
device’s RAM usage, you need additional tools like FreeXplain by XDA
Senior Member zeppelinrox.
The FreeXplain script can be used to display more
accurate information about used RAM. You can use a long list of
operators, which show brief or more detailed information about usage of
your physical memory. Usage is very simple: Just type freex, and you’ll get the results in user-friendly colors, so you can easily see the difference. Simple and efficient.
More information regarding RAM consumption and the script itself can be found in the original 
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