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 / Solutions

Serial Dilution Calculator

Compute the final concentration after N serial dilutions at a 1-in-R dilution factor (e.g., five 1:10 dilutions). Report...

Basic
12,711 4.9 1 min
Physics / Mechanics

Heat Conduction Calculator

Compute the steady-state rate of heat conduction through a flat wall or slab using Fourier's law of conduction: Q = k ·...

Basic
7,533 4.2 1 min
Physics / Electricity

RL Time Constant Calculator

Compute the time constant τ = L / R of a series RL circuit, the time to reach 63 % of final current, and the rough cutof...

Basic
15,815 4.4 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