Mass in special relativity (including the kinetic energy of the gas) only when it is measured in the center of momentum frame. Just as is the case for single particles, the calculated "rest mass" of such a container of gas does not change when it is in motion, although its "relativistic mass" does change. The container may even be subjected to a force which gives it an overall velocity, or else (equivalently) it may be viewed from an inertial frame in which it has an overall velocity (that is, technically, a frame in which its center of mass has a velocity). In this case,
This Is What Rock n' Roll Looks Like instead, the classroom setting was criticized while the presence of Lil Wayne was appreciated. The song was also used in the 2013 film, "The Smurfs 2". This Is What Rock n' Roll Looks Like "This Is What Rock n' Roll Looks Like" is the debut single of American industrial singer-songwriter Porcelain Black, featuring American rapper Lil Wayne. This song serves as the lead single from the singer's debut studio album, "Mannequin Factory". Produced by Moroccan-Swedish producer RedOne, who had originally discovered Black, "This Is What Rock n' Roll Looks Like" is influenced by the genre of rock, lyrically stating how