Causes. In ALS, the nerve cells that control the movement of your muscles gradually die, so your muscles progressively weaken and begin to waste away. ALS is inherited in 5 to 10 percent of cases. The other cases appear to occur randomly.
1 The smaller studio uprights usually weigh between 400 and 600 pounds. 2  The monstrous full vertical or large upright piano can weigh as much as half a ton.  A studio piano's center of gravity is also lower than a large upright's, as it is about 4 feet (1.2 m) tall as opposed to a large upright's roughly 5-foot height.
Vote for this answer. I should have said, All standard pianos have 88 keys.. The length and height of a piano varies with the model and manufacturer--an upright piano is taller than a spinet, and a grand piano is longer than either. However, there is only a slight variation in the width of a standard piano.