Distilled water is water that has had many of its impurities removed through distillation. Distillation involves boiling the water and then condensing the steam into a clean container.
Distillation is a process of separating the component substances from a liquid mixture by selective evaporation and condensation. Distillation may result in essentially complete separation (nearly pure components), or it may be partial separation that increases the concentration of selected components of the mixture.
Distilled water is also commonly used to top off Lead Acid Batteries. The presence of other ions commonly found in tap water will drastically reduce an automobile battery’s lifespan. Distilled water is preferable to tap water for use in automotive cooling systems. Distilled water is also preferable to tap water for use in model steam engine boilers and model engines of other types.