Hey everyone I was just curious. Piano, after, is classified as a string instrument I believe (I hope my theory's right! ) and that other instruments like guitar and violin are no doubt string instruments as well. As you know, guitar and violin strings can snap and break, sometimes giving the performer minor injuries like cuts if they are unlucky enough to be close to the breaking.
I was wondering if it's possible for the strings in a piano to break. Especially a grand, think of how long those strings are! I bet I'd go blind if a piano string ever snapped at me. Anywayz, please tell me if it's possible, and if it is, if it's very dangerous (probably not)

Piano strings break for many reasons. Mostly because of too much friction at the bearing points, those points being the tuning pin becket, or the agraffe/pressure bar area. Not very often will a string break at the tied end of the plate hitch pin.
Piano wire, when up to the pitch of A440, is only pulled to 60% of its tensile strength. Most of the time when piano wire breaks it is because of a fault in the wire, corrosion preventing the movement or adjustment of the wire (tuning) or the molecules have deteriorated (metal fatigue).
Using WD40 as a lubricant is not a good idea. Oils tend to migrate down the strings in a vertical at times and contaminate the damper felt.
On a grand the oils will still migrate by vibration to other areas not affected by rust or other contaminants.
If you feel compelled to use a lubricant use one of the lubes sold by the supply houses.....Protek CLP comes to mind......
Usually when a string does break, the plate bars above the strings in a grand keep the string inside the instrument for the most part, unless the lid happens to be raised, then it might travel out onto the floor in front of the instrument.
Cheers,
Dan Silverwood