By late May, the temperature has warmed up considerably to herald warm summer days. Once the engine has warmed, returning warm fuel prevents waxing in the tank. Water can be warmed by heat transfer with milk. The Volt features a battery pack that can be both warmed or cooled. The temperature had warmed slightly, but at , was dropping again. Toilet seats are frequently warmed by electric heat. It should be warmed to room temperature for use. There, moist air is warmed by the Earth's surface, decreases in density and rises. Instead, they are simply warmed to between above the coating's melting point. She was taken to the prison hospital where she was warmed by hot water bottles. The clathrates were buried beneath mud that was disturbed as the oceans warmed. Supplemental oxygen can be given and it may be warmed and humidified. These muscles have to be properly warmed up and exercised before practicing. The nests are positioned so that they can be warmed by the sun. The elixir would be warmed in sunlight, then taken as treatment.