What is the critical point of acetylene?

The critical point of a substance represents the temperature and pressure at which it can exist in a vapor and liquid state at equilibrium. For acetylene, the critical point is specifically defined at 28 psi and 21°C. This information is crucial for understanding how acetylene behaves under various pressure and temperature conditions, especially in welding environments where acetylene is commonly used as a fuel gas.

Knowing the critical point allows welders and technicians to handle acetylene safely, ensuring that it does not revert to a solid state under high pressures or become unstable in different temperature conditions. This understanding is vital in preventing accidents and ensuring efficiency when using acetylene in welding processes. Thus, the correct assertion about acetylene's critical point is accurately represented, confirming its importance in welding theory and practice.