Solid block



Solid blocks consist of any type of block that is not a liquid and cannot be walked through at the normal walking speed.

Properties
A block can be considered solid if it has a collision box that players, mobs, or other entities cannot move through and those caught inside a solid block may suffocate. For a block to be solid it also has to not by broken by flowing liquids. Blocks such as iron blocks are solid, and cobwebs are nonsolid, because players can move through them slowly and water flow can break them.

The collision property of solid blocks allows block-dependent blocks and entities to be placed upon them, including:



Other block-dependent blocks may be placed only on full, opaque solid blocks (with a few exceptions):



Solid blocks are also considered when generating structures.

List of solid blocks
The following blocks are all solid blocks. They are categorized by their material.

List of non-solid blocks
These blocks consist of any block that is not solid.

Height
Most solid blocks are 1 meter high, but certain blocks have non-standard block heights.

A player can automatically step up from a lower to a higher height, if the difference is at most 0.6 ($3/5$) of a block. From ground level, this is anything the height of a boat or less.

A player can fit through spaces as small as 1.8125 (2 - $3/16$) blocks high, since players are 1.8 blocks tall. This allows players to fit through a 2-block gap with a floor as high as a trapdoor or less.

When, a player can fit through spaces as small as 1.75 (2 - $1/4$) blocks high, since sneaking players are 1.65 blocks tall. This allows players to fit through a 2-block gap with a floor as high as 3 layers of snow or less.

When gliding with elytra, a player can fit through spaces as small as 0.625 (1 - $3/8$) blocks high, since gliding players are 0.6 blocks tall. This allows players to fit through a 1-block gap with a floor as high as 4 layers of snow, or a flower pot, or a daylight sensor, or less.

Note that doors, although appearing to be one 2-meter-high block, are actually composed of two (top and bottom) 1-meter-high blocks.

Here is a list of blocks with non-standard heights, from tallest to shortest in height: