Which of the following best describes a colloid?

A colloid is best described as a mixture containing intermediate-sized particles that are larger than those found in a solution but smaller than those in a suspension. These particles are generally within the range of 1 nanometer to 1 micrometer in diameter. Due to their size, colloidal particles do not settle out over time like those in suspensions, allowing the mixture to remain somewhat homogeneous, even though it typically exhibits different properties compared to true solutions.

In a colloid, the dispersed phase (the particles) does not separate from the continuous phase (the liquid or gas in which they are dispersed), which means that the mixture remains stable without any changes in its composition under standard conditions. This unique property of colloids distinguishes them from suspensions, where larger particles will settle over time.