Evaporate/ɪˈvæpəreɪt/ Definition 1 of 2Pro Tip 1/3Heat Requirement Evaporate usually involves heat. It implies a substance turns into gas when warmed. If you heat water, it will eventually evaporate. Pro Tip 2/3Natural Process Evaporation can occur in natural settings without human intervention, like lakes under sunlight. Puddles evaporate more quickly on a hot day. Pro Tip 3/3Gradual Change Evaporation isn't instant; it happens over time, often unnoticed until much has evaporated. I didn't notice how much my drink evaporated in the heat.