Does hot or cold water make a difference when making a lava lamp?

Yes, the temperature of the water can affect the behavior of the ingredients in a homemade lava lamp. Hot water decreases the density of the colored water, allowing it to rise and create bubbles more easily when mixed with oil. Cold water, on the other hand, may cause the colored water to sink and not exhibit the same bubbly motion. For the best effect, warm water is generally recommended.