Liquid Ethylene Density Calculator

Liquid ethylene density varies with temperature and pressure. At -40°C and atmospheric pressure, density is approximately 0.447 g/cm³. Near the critical point (9.2°C, 50.4 bar), density decreases to about 0.22 g/cm³. The density decreases as temperature increases because the liquid expands. The critical density of ethylene is approximately 0.215 g/cm³.

Ethylene reaches its critical point at 9.2°C (282.3 K) and 50.4 bar (5.04 MPa). At this point, the liquid and vapor phases become indistinguishable - this is the supercritical state. The critical density is approximately 0.215 g/cm³ (215 kg/m³). Above this temperature, ethylene exists as a supercritical fluid with properties of both liquids and gases.

Liquid ethylene density decreases with increasing temperature, following an exponential relationship. From -150°C (0.656 g/cm³) to near the critical point at 9°C (~0.22 g/cm³), the density decreases by about 66%. This thermal expansion is important for storage and transport of ethylene. The relationship is approximately: ρ(T) = exp(A + BT + CT² + DT³), where T is in °C.

Knowing ethylene density is crucial for: (1) Storage tank design and level measurements, (2) Pipeline flow calculations and custody transfer, (3) Polymerization reactor design where monomer density affects mixing and reaction rates, (4) Cryogenic shipping and storage system design. Accurate density values ensure safety and efficiency in chemical plants and petrochemical facilities.

No, ethylene cannot remain liquid at room temperature (20-25°C) under normal pressure. Its boiling point is -103.9°C at 1 atm. At room temperature, ethylene exists only as a gas. To maintain ethylene as a liquid at room temperature, it must be stored under high pressure (above 50 bar) in a supercritical state, or at cryogenic temperatures below -104°C.