What keeps things colder-plastic wrap or aluminum foil for a science project?

Reason:

- Thermal conductivity: The ability of a material to transfer heat is known as thermal conductivity. Metals, like aluminum foil, have high thermal conductivity, which means they can transfer heat quickly. On the other hand, plastics, like plastic wrap, have low thermal conductivity, which means they are poor at transferring heat.

- Reflectivity: Aluminum foil is a highly reflective material, meaning it can reflect heat away from the object it is covering. This helps to keep the object cooler. In contrast, plastic wrap is not as reflective, so it does not reflect heat as effectively.

In summary, aluminum foil's high thermal conductivity and reflectivity make it more effective at keeping things colder than plastic wrap.