* Both are heterogeneous mixtures: Meaning their composition isn't uniform throughout. You can usually see different parts of the mixture.
* Both involve a dispersed phase and a dispersing medium: The dispersed phase is the substance that's spread out, and the dispersing medium is the substance it's spread within.
* Both can be separated by physical means: For example, filtration or centrifugation can separate the dispersed particles from the dispersing medium.
Key Difference:
The main difference lies in the size of the dispersed particles.
* Colloids: The dispersed particles are larger than molecules but smaller than those in a suspension (1nm to 1000nm). They are not easily settled out and will scatter light (Tyndall effect).
* Suspensions: The dispersed particles are larger than 1000nm and can be easily settled out by gravity. They do not exhibit the Tyndall effect.
Examples:
* Colloid: Milk (fat droplets dispersed in water), fog (water droplets dispersed in air)
* Suspension: Muddy water (soil particles dispersed in water), sand in water
It's also worth noting that sometimes the distinction between a colloid and a suspension can be blurred, particularly if the dispersed particles in a suspension are very small or if the mixture is constantly agitated.
