Which lab equipment is used as a cover to prevent heated materials from splattering out of the container and as a holding plate for hot or flammable materials?

Watchglass is a lab equipment that is used as a cover to prevent heated materials from splattering out of the container and as a holding plate for hot or flammable materials

Explanation:

Watch glass is an equipment used as a cover to prevent heated materials from splattering out of the container and as a holding plate for hot or flammable materials. It is a kind of concave glass which is also used to evaporate a liquid and also provides good air circulation which is used during cooking. The name watchglass was derived as they are see through and so similar to pocket glasses.

less than one you can't create energy

this is poiselle's equation from fluid mechanic in physics. mech eng