Air Properties Table (1 atm)

• •Use the Air Properties Table (1 atm) to check your hand calculations on homework or exam problems — comparing its result with your own working helps identify arithmetic errors before they propagate.
• •Use it during the early design phase to rapidly iterate on parameters and narrow down feasible configurations before committing time to detailed finite element simulations or full design packages.
• •Use it when reviewing a colleague's calculation or checking a vendor's data sheet for plausibility — a quick sanity check can prevent costly downstream errors.
• •Use it to generate reference data for a technical report or presentation without manual computation, ensuring consistent, reproducible numbers throughout the document.
• •Use it in the field when a quick estimate is needed and a full engineering software package is not available.

The Air Properties Table (1 atm) is a precision engineering calculation tool designed for students, engineers, and technical professionals. Thermophysical properties of dry air at 1 atm from 200 K to 2000 K: density, cp, viscosity, thermal conductivity, Prandtl number and thermal diffusivity, generated with CoolProp. Sortable. All calculations are performed using established engineering formulas from the relevant scientific literature and standards. Follow the units printed beside each field. Where a unit selector is provided, the selected unit is converted internally. Results are computed in your browser without sending data to a server, which keeps your inputs private. This calculator is intended as a supplementary tool for learning and design exploration; always verify results against authoritative references for safety-critical applications.

Air properties tables tabulate the temperature-dependent thermophysical properties of dry air at 1 atm pressure across a wide temperature range (typically 200-2000 K). Key properties include density (ρ, kg/m³), specific heat at constant pressure (c_p, J/(kg·K)), dynamic viscosity (μ, Pa·s), kinematic viscosity (ν = μ/ρ, m²/s), thermal conductivity (k, W/(m·K)), thermal diffusivity (α, m²/s), and Prandtl number (Pr = ν/α = μc_p/k, dimensionless). These properties are used in convective heat transfer calculations, fluid mechanics analyses, and aerodynamic design. Air at standard conditions (15°C, 101.325 kPa) has density 1.2255 kg/m³, viscosity 1.80 × 10⁻⁵ Pa·s, thermal conductivity 0.0255 W/(m·K), and Prandtl number about 0.709. As temperature increases, density decreases (ideal gas behavior), viscosity and thermal conductivity increase, and the Prandtl number stays between about 0.70 and 0.74. Specific heat rises from 1.006 kJ/(kg·K) at 300 K to 1.141 at 1000 K and 1.250 at 2000 K. The table treats air as a fixed, non-reacting mixture (no dissociation). Below 200 K, outside this table, departures from ideal-gas behavior grow, and at 1 atm air condenses at about 79–82 K. The tables are essential for designing HVAC systems, combustion equipment, heat exchangers, gas turbines, and any application involving air as the working fluid or coolant.

• •HVAC system design: compute air density, viscosity, and thermal conductivity at design temperatures for duct sizing, fan selection, and heat exchanger calculations.
• •Gas turbine analysis: use temperature-dependent air properties for compressor and turbine efficiency calculations across the large temperature range from intake to turbine inlet.
• •Combustion equipment design: air properties are needed for computing combustion air flow, stoichiometric calculations, and exhaust gas heat transfer.
• •Aerodynamic analysis: compressibility corrections and boundary layer analysis require accurate air properties at flight conditions.
• •Electronic equipment cooling: natural and forced convection cooling of electronics uses air properties at component operating temperatures.