1. What is a Percent Transmittance Calculator?

Definition: This calculator converts absorbance values to percent transmittance using the Beer-Lambert law.

Purpose: It helps scientists, chemists, and students working with spectrophotometry to quickly convert between these two important optical measurements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \%T \) — Percent Transmittance (%)
• \( A \) — Absorbance (dimensionless)

Explanation: The formula is derived from the Beer-Lambert law, which relates the absorption of light to the properties of the material through which the light is traveling.

3. Importance of Transmittance Calculation

Details: Percent transmittance is crucial in spectroscopy for determining sample concentration, purity, and other optical properties.

4. Using the Calculator

Tips: Simply enter the absorbance value (must be ≥ 0). The calculator will compute the corresponding percent transmittance.

5. Frequently Asked Questions (FAQ)

Q1: What is the relationship between absorbance and transmittance?
A: They are inversely related - as absorbance increases, transmittance decreases exponentially.

Q2: What does 100% transmittance mean?
A: It means all light passes through the sample (A = 0). 0% means no light passes through (very high absorbance).

Q3: Can transmittance be greater than 100%?
A: Normally no, unless there's light amplification or scattering effects.

Q4: How precise is this calculation?
A: It's mathematically exact, assuming the Beer-Lambert law applies to your sample.

Q5: What's a typical absorbance range for this calculator?
A: Works for any A ≥ 0, but most practical measurements are between 0.001 and 3.0.