Answer the question briefly and the point:
Are all constants dimensionless ?

Explanation

To answer the question "Are all constants dimensionless?" we can break it down into a few key points:

1. **Definition of Constants**: Constants can be categorized into two types: numerical constants and physical constants.

2. **Numerical Constants**: These are pure numbers used in mathematics, such as π (pi) or e (Euler's number). Numerical constants are dimensionless because they do not have any physical units associated with them.

3. **Physical Constants**: These are constants that arise in physical laws and equations, such as the gravitational constant (G), the speed of light (c), and Planck's constant (h). Physical constants have specific dimensions and units associated with them. For example, the gravitational constant G has dimensions of [M^-1 L^3 T^-2].

...