density

The amount of a certain phenomenon (such as stuff, things, energy, or otherwise) in a given area (surface area) or volume (amount of space).

In the past two years, NASA’s Kepler Space Telescope has located nearly 3,000 exoplanet candidates ranging from sub-Earth-sized minions to gas giants that dwarf our own Jupiter. Their densities range from that of styrofoam to iron.

The microcannon was seen moving at about a micron per second, it was about 15 microns long, and the high speed photograph was done in water (density of 1 kg/L, viscosity of about 0.001 pascal seconds).

The amount of a certain phenomenon (such as stuff, things, energy, or otherwise) in a given area (surface area) or volume (amount of space).

The number of particles per unit volume of a specified volume can be considered to be the particle density for the specified volume.

Density, which is genetically linked, deals with the number of strands per square inch on your scalp. Normal density can range from slight to substantial, varying from person to person.

The probability that an outcome will fall into a given range, per unit of that range; the relative likelihood of possible values of a continuous random variable.

Stupidity.

There's only so much density that pedagogy can penetrate.