Parachor Formula:
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Definition: Parachor is a physical quantity that relates surface tension to molecular structure and is used to predict properties of liquids.
Purpose: It helps in understanding molecular interactions and predicting surface tension of liquids based on their composition.
The calculator uses the formula:
Where:
Explanation: The formula relates the molecular properties to surface tension through dimensional analysis.
Details: Parachor values are useful in chemical engineering for predicting surface tension, studying molecular structure, and designing industrial processes.
Tips: Enter the molar mass, liquid density, vapor density (default 0.5 kg/m³), and surface tension (default 0.073 N/m for water at 20°C). All values must be positive except vapor density which can be zero.
Q1: What are typical Parachor values?
A: Parachor values typically range from 1×10⁻⁵ to 1×10⁻⁴ m³/mol·(N/m)^0.25 depending on the substance.
Q2: Why is the exponent 1/4 used in the formula?
A: The exponent comes from dimensional analysis that relates surface tension to molecular volume.
Q3: When can vapor density be neglected?
A: For most liquids at normal conditions, vapor density is much smaller than liquid density and can often be approximated as zero.
Q4: What are common surface tension values?
A: Water at 20°C has 0.073 N/m, mercury 0.487 N/m, and ethanol 0.022 N/m.
Q5: How is molar mass determined?
A: Molar mass is the sum of atomic masses of all atoms in a molecule, available from chemical formulas and periodic tables.