The key difference between nano silver and colloidal silver is that the nano silver refers to nanoparticles of silver having the particle size between 1 and 100 nm whereas colloidal silver refers to silver particles having the particle size higher than 100 nm suspended in a liquid.
The terms nano silver and colloidal silver are used to name different sizes of silver particles we use for different purposes. Nano silver particles have their dimensions between 1 and 100 nm while the size of colloidal silver particles is larger than that.
