Dr. Helena Ortiz
Featured contributor PhD Applied Physics; former research associate at a national metrology lab.

Dr. Helena Ortiz

Senior Reviewer, Science & Engineering

0 calculators 0 articles Member since Jun 2026
Chemistry

pKa ↔ Ka Converter

Convert between the acid dissociation constant Ka and its logarithmic form pKa using pKa = −log₁₀(Ka). Pick the directio...

Basic
6,889 4.9 1 min
Physics

Brewster's Angle Calculator

Compute Brewster's angle θ_B = atan(n₂ / n₁) — the incidence angle at which p-polarized light is fully transmitted (zero...

Basic
1,499 4.8 1 min

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Reviewed by Dr. Helena Ortiz

These calculators were technically reviewed by Dr. Helena Ortiz for accuracy.

Chemistry / Solutions

Gas Density Calculator

Compute the density of an ideal gas at given pressure and temperature from its molar mass, using ρ = PM/(RT).

Basic
4,981 4.2 1 min
Physics / Electricity

Current Divider Calculator

Compute the current through one branch of a two-resistor parallel current divider from the total source current.

Basic
13,508 4.7 1 min
Physics / Mechanics

Velocity Calculator

Compute velocity from displacement and time, or solve for either one given the other two.

Basic
20,035 4.1 1 min