You're asking about a solid with a density of 0.82 g/ml. That's a very low density, which means the solid is very lightweight compared to its volume.

Here's the problem: There are many solids with densities around that range! It's impossible to tell you exactly which solid it is without more information.

Here's why:

* Density varies with temperature and pressure: The density of a substance can change slightly depending on the temperature and pressure.

* Many materials have similar densities: There are numerous plastics, foams, and even some types of wood that fall in this density range.

To help you narrow it down, I'd need more context:

* What is the solid used for?

* What are its properties (color, texture, etc.)?

* Where did you find this information?

With more information, I can help you identify the specific solid.