Here's why:
* Density: Sandstone is denser than water. This means it has more mass packed into the same volume compared to water. For an object to float, it needs to be less dense than the fluid it's in.
* Porosity: While sandstone can have pores, these pores are typically filled with air or water. The air doesn't significantly reduce the overall density enough to make it float.
Exceptions:
* Very porous sandstone: If a sandstone has extremely large pores, and those pores are filled with air, it *could* potentially float. However, this would be a very rare and specific case.
* Shape: A very thin, flat piece of sandstone, like a thin slab, might have enough surface area to displace enough water to partially float.
In general: Sandstone, like most rocks, is denser than water, so it will sink.
