Item bank an oven that cooks by cycling warm air through the bottom and out the top. grabbing a warm coffee mug to warm your hands. warm water rising to the surface of the ocean and cooler water sinking. cooking popcorn using a microwave. warm air rising off of the pavement. burning yourself by touching boiling water. heat from a fire warming your hands. heat from the sun hitting a solar panel. putting an ice pack on an injury. the handle of a pot becoming too hot to grab as it cooks on the stove