Final Answer:
The matter density mentioned in the original paper is typically expressed in grams per cubic centimeter (g/cm³).
Step-by-step explanation:
In the field of physics, particularly when discussing properties related to mass and volume, matter density is a crucial parameter. It is defined as the mass of an object per unit volume and is commonly measured in grams per cubic centimeter (g/cm³). The subscript "gm" in the original question refers to grams, which is the unit of mass. Therefore, when the question mentions "gm per cm cubed," it is specifying that the matter density is given in grams per cubic centimeter.
The formula for matter density (ρ) is expressed as ρ = m/V, where 'm' represents the mass of the object, and 'V' represents its volume. When we express the density in grams per cubic centimeter, we are essentially stating that the mass is measured in grams, and the volume is measured in cubic centimeters. This unit of measurement is common in scientific literature, allowing for consistency and ease of comparison between different materials.
In summary, the notation "gm per cm cubed" is a concise and standardized way of denoting matter density in the scientific community, specifically indicating that the mass is measured in grams, and the volume is measured in cubic centimeters. This notation ensures clarity and facilitates accurate communication in discussions involving the density of materials.