Final answer:
Option 1: The correct answer is a frictionless piston-cylinder device, which is an idealized concept in thermodynamics where a piston operates without friction within a cylinder.
Step-by-step explanation:
The device that consists of a frictionless piston and cylinder is known as a frictionless piston-cylinder device. This idealized device is commonly used in thermodynamics to illustrate various processes without the complexities introduced by friction. In the scenario described, Vessel B with a piston free to move under a constant external pressure p is a representation of such a device. The piston can move smoothly within the cylinder, allowing for work to be done on or by the gas within during expansion or compression, without any loss of energy due to friction.
The device that consists of a frictionless piston and cylinder is called a frictionless piston cylinder device.
This device is commonly used in physics experiments to study the behavior of gases.
By manipulating the pressure and volume of the gas inside the cylinder, scientists can investigate the relationship between these variables.