An oven that cooks by cycling warm air through the bottom and out the top

burning yourself by touching boiling water

cooking popcorn using a microwave

grabbing a warm coffee mug to warm your hands

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

warm air rising off of the pavement

warm water rising to the surface of the ocean and cooler water sinking

conduction

convection

radiation