Conservation law, also called law of conservation, in physics, several principles that state that certain physical properties (i.e., measurable quantities) do not change in the course of time within an isolated physical system. In classical physics, laws of this type govern energy, momentum, angular momentum, mass, and electric charge.
On New Yearâs Eve, the Metrorail system will open at 7 a.m. with special extended service on all lines until 3 a.m. The additional three hours of service â consistent with past years â is a special exception to a moratorium on extended hours during the year-long SafeTrack maintenance program.
METRORail Tips: Tickets cost $1.25 (one-way) and can be purchased using cash or credit at all rail stops. METRORail hours are: 4:30am - 11:40pm (M-TH) 4:30am - 2:20am (F) 5:30am - 2:20am (SAT) 5:30am - 11:40pm (SUN) Travel time from end to end is 30 minutes. For METRORail information, call (713) 635-4000 or visit www.RideMetro.org. Downtown