Here's why:
* Atomic Mass: Atomic mass is the average mass of an atom of a particular element. It's expressed in atomic mass units (amu).
* Common Gas: The atomic mass 20.26 is very close to the atomic mass of neon (Ne), a noble gas. Neon is often used in signs, lasers, and other applications.
Therefore, the gas sample labeled 20.26 is most likely neon.
It's important to note that the label could also refer to something else like:
* Pressure: Pressure is often measured in units like atmospheres (atm), kilopascals (kPa), or pounds per square inch (psi).
* Volume: Volume is typically measured in liters (L) or milliliters (mL).
* Temperature: Temperature is usually measured in degrees Celsius (°C) or Fahrenheit (°F).
However, considering the context of an international science convention, atomic mass is the most likely interpretation.
