On piano music sheets how do you know which part is the right hand or left?

On piano music sheets, the right hand part is typically written on the upper staff, while the left hand part is written on the lower staff. The right hand part is often notated in treble clef, while the left hand part is often notated in bass clef. Additionally, the right hand part is usually played by the right hand, while the left hand part is usually played by the left hand.