对流白板动画

A side-view cutaway of a single clear glass pot of water sitting on a small stove flame. Inside the water, curved arrows show the convection current: warm red arrows rise straight up through the middle of the pot from the heated bottom, turn outwards along the top surface, then blue arrows sink down along both side walls and turn back inwards along the bottom, forming two closed loops, one on the left half and one on the right half. Only the pot, the water, the flame and the arrows; nothing else in the picture. Plain background with lots of empty space, 4:3. Coloured pencil and watercolour marker, clean black ink outlines, warm off-white paper, no text.