It is somewhat thinner, and when undiluted is not fuming.

This acid may be obtained in a solid and dry state, called anhydrous sulphuric acid.
The common sulphuric acid is made by burning sulphur, which forms sulphurous acid.

To convert this into sulphuric acid and gain more oxygen, nitric acid, which is rich in that body, is added.

It forms a limpid, colorless fluid, of a specific gravity of 1.8.It boils at 620 deg.; it freezes at 15 deg.

It is acrid and caustic, and intensely acid in all its characters, even when largely diluted.
Its attraction for basis is such that it separates or expels all other acids, more or less perfectly, from their combinations.