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I removed tnt from this page, because it behaves as a particle, not as a block. If this page is meant to be a page on general physics within minecraft, it should include information on water and lava flow, as well as the way particles behave.--Phygar 16:04, 10 January 2011 (UTC)

Indeed. That makes sense. -- Linkyu 18:31, 10 January 2011 (UTC)

The only difference between active TNT and falling sand/gravel is that sand and gravel fall straight down rather than offset a bit, and they turn into blocks when they hit ground. They are otherwise very similar: for example, they can all be fired out of TNT cannons (they can be sent on arbitrary trajectories by explosions, not just straight down). They also happen to be the same kind of thing in the network protocol. —KPReid 18:40, 10 January 2011 (UTC)
Sand and gravel behave that way only while in a falling state though, correct? Should the page be edited to reflect that, while taking into account the other objects in the network protocol? The page states that physics occur on the blocks gravel and sand. Perhaps you could mention that they remain blocks until their downward path is clear, and then become physics objects at that point.--Phygar 16:22, 11 January 2011 (UTC)
As far as I've learned, you're exactly right: they convert from blocks to entities to blocks. Maybe I'll find time to write it up well. —KPReid 18:25, 11 January 2011 (UTC)
Done! I have now written the Entity page and made this page into more of an overview. —KPReid 22:12, 21 February 2011 (UTC)