1. What is Absorbance to Transmittance Conversion?

The conversion from absorbance to transmittance is a fundamental calculation in spectroscopy that relates how much light is absorbed by a sample to how much light passes through it. This relationship is governed by the Beer-Lambert law.

2. How Does the Calculator Work?

The calculator uses the transmittance formula:

Where:

• \( T \) — Transmittance (unitless, 0-1)
• \( A \) — Absorbance (AU)

Explanation: The formula shows the inverse logarithmic relationship between absorbance and transmittance. As absorbance increases, transmittance decreases exponentially.

3. Importance of Transmittance Calculation

Details: Transmittance calculation is essential in various fields including chemistry, physics, environmental science, and medical diagnostics. It helps determine sample concentration, purity, and optical properties in spectrophotometric analysis.

4. Using the Calculator

Tips: Enter the absorbance value (must be ≥0). The calculator will provide both the decimal transmittance value (0-1) and the percentage transmittance (0-100%).

5. Frequently Asked Questions (FAQ)

Q1: What is the relationship between absorbance and transmittance?
A: Absorbance and transmittance have an inverse logarithmic relationship. Absorbance = -log₁₀(Transmittance).

Q2: What are typical absorbance values in spectroscopy?
A: Most spectrophotometric measurements work best with absorbance values between 0.1 and 1.0 AU for optimal accuracy.

Q3: Can absorbance be greater than 1?
A: Yes, absorbance can be greater than 1, though values above 2-3 may indicate very concentrated samples that might need dilution for accurate measurement.

Q4: What does 100% transmittance mean?
A: 100% transmittance means no light is absorbed by the sample (absorbance = 0), typically seen with blank/reference solutions.

Q5: How is percentage transmittance calculated?
A: Percentage transmittance = T × 100%, where T is the decimal transmittance value.