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Percent Transmittance Equation:
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Percent Transmittance (%T) is a measurement of how much light passes through a sample compared to the amount of light that passes through a reference blank. It is commonly used in spectroscopy and photometry to quantify the transmission of light through materials.
The calculator uses the Percent Transmittance equation:
Where:
Explanation: The equation converts absorbance values to percent transmittance using the logarithmic relationship between light transmission and absorption.
Details: Percent transmittance is crucial in various scientific fields including chemistry, biology, and environmental science for quantifying sample concentration, purity analysis, and material characterization in spectroscopic measurements.
Tips: Enter absorbance value (must be ≥0). The calculator will compute the corresponding percent transmittance.
Q1: What is the relationship between absorbance and transmittance?
A: Absorbance and transmittance have an inverse logarithmic relationship. As absorbance increases, transmittance decreases exponentially.
Q2: What are typical percent transmittance values?
A: Values range from 0% (complete absorption) to 100% (no absorption). Most analytical measurements fall between 10% and 90% transmittance.
Q3: Why is the logarithmic scale used?
A: The logarithmic scale linearizes the relationship between concentration and light absorption, making quantitative analysis more straightforward.
Q4: What factors can affect transmittance measurements?
A: Sample concentration, path length, wavelength of light, temperature, and solvent properties can all influence transmittance measurements.
Q5: How is this different from absorbance?
A: Absorbance measures light absorbed by a sample, while transmittance measures light passed through a sample. They are mathematically related through the equation %T = 100 × 10^(-A).