The specific gravity of cement is not a fixed value, as it varies depending on the type of cement and its composition. However, a typical range for the specific gravity of Portland cement is 3.10 to 3.15.

Here's a breakdown:

* Specific gravity is the ratio of the density of a substance to the density of a reference substance, usually water at 4°C.

* Cement is a fine powder that is mixed with water to create a paste that hardens and binds other materials together.

* Portland cement is the most common type of cement, and its composition can vary depending on the specific additives and manufacturing process.

Note: The specific gravity of cement is an important factor in determining the weight and volume of concrete mixes. It's also used to calculate the amount of cement needed for a specific project.