Explanation

Dynamic range is the ratio between the largest and smallest values that a certain quantity can assume.

It is often used in the context of signals, like sound and light.

In music, dynamic range describes the difference between the quietest and loudest volume of an instrument, part or piece of music.

Explanation

The fundamental units in the SI (International System of Units) are:

1. The meter (m) for length,
2. The kilogram (kg) for mass,
3. The second (s) for time,
4. The ampere (A) for electric current,
5. The kelvin (K) for thermodynamic temperature,
6. The mole (mol) for the amount of substance, 
7. The candela (cd) for luminous intensity.

These seven base units are independent and form the foundation of the SI system, from which all other units are derived. 

Explanation

The Japan Aerospace Exploration Agency is the Japanese national aerospace and space agency.