It became clear that full physical models cannot be used for long-term forecasting.

Such flexibility is not possible with a physical model.

Scientists had to build physical models out of brass, a process that took months.

The common physical model of a Klein bottle is a similar construction.

The only physical model now at the center was built five years ago at Berkeley.

A physical model may show inner parts that are normally not visible.

"But over the next five to 10 years, we're going to be transferring our brand from a physical model to an internet one."

The mathematical problem therefore is solved by a physical model of itself.

It claims to be "based on a real physical model."

"I don't see its connection to the physical model that we understand at the moment, and I'm not sure it's correct."