# Is a suspension a homogeneous or a heterogeneous mixture? What about a colloid?

A suspension is definitely a mixture of two phases.........and thus a suspension is definitely $\text{heterogeneous}$. A $\text{colloid}$ does not fall under this umbrella, inasmuch as particle size in your typical colloid, is approx. $\left(1 - 5\right) \times {10}^{-} 9 \cdot m$, whereas particle size in a suspension is approx. $1000 \times {10}^{-} 9 \cdot m$.