Here's why:

* Tarmac is a type of asphalt, which is a mixture of aggregate (like crushed rock) and bitumen (a thick, sticky petroleum product).

* Bitumen is a solid at room temperature, but it becomes softer and more pliable when heated.

* The mixture of aggregate and bitumen creates a solid, durable surface that is used for roads, parking lots, and other surfaces.

While tarmac can become somewhat malleable under heat, it's not a liquid in its normal state.