Explain whether smoke filling up a room is diffusion or not.

it is diffusion

Explanation:

smoke rises from one corner of the room and spreads to the rest of the room, resulting in diffusion

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation:

1. they vary with a higher number because boiling is way hotter than melting