Neutron STEM Lab
Neutron STEM Lab

A practical STEM lab for calculations, simulations, and study.

Free engineering and science tools for students. Each calculator, simulator, and visualizer is built as an expandable module with shareable configurations and documented assumptions.

Available tools

Each published tool includes a visual thumbnail so students can identify simulations and calculators before opening them.

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Sinusoidal waveform, impedance triangle, RLC response, transformer, and three-phase phasors.
Electrical Engineeringbetaintermediate

AC Circuits Workbench

Analyze sinusoidal signals, phasors, complex impedance, RLC networks, AC power, power-factor correction, filters, transformers, and balanced three-phase systems.

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A titration flask beside a pH scale, equilibrium arrows, and a solubility graph.
Chemistrybetaintermediate

Acids, Bases, and Equilibrium Learning Lab

Fourteen guided chemistry lessons that connect particles, reactions, equations, graphs, and worked reasoning for acids, bases, equilibrium, buffers, titrations, and solubility.

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Layered mathematical curves, an integral area, a complex-plane vector, and data points on a dark technical grid.
Mathematicsbetaadvanced

Advanced Mathematics Workbench

Explore numerical derivatives and integrals, interpolation, polynomial regression, Fourier series, complex numbers, partial fractions, differential equations, Taylor series, and coordinate geometry.

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Operational amplifier, Bode response, transistor gain, hysteresis, and oscillator waveform.
Electrical Engineeringbetaintermediate

Analog Electronics Workbench

Study op-amp feedback, summing and differential stages, active filters, comparators, transistor amplifiers, instrumentation amplifiers, and oscillators.

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Crystal unit cell, diffraction planes, and diffusion concentration profile.
Materials Sciencebetaintermediate

Atomic Structure & Diffusion Workbench

Explore crystal structures, lattice planes, diffraction, defects, alloy density, and atomic diffusion.

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Capacitor plates, wound inductor, transient curves, and LC energy exchange.
Electrical Engineeringbetaintroductory

Capacitors and Inductors Workbench

Learn electric and magnetic energy storage through capacitor and inductor networks, physical geometry, dielectrics, transients, reactance, coupling, and LC resonance.

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A multi-arm pendulum trace with dashed forecast ghosts peeling away from the true path.
Physicsbetaadvanced

Chaotic Pendulum Forecast Lab

Integrate a two to seven arm pendulum with Runge-Kutta and race three statistical forecasters against deterministic chaos.

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A compact periodic table, ion cards, molecular shape, and equation reference sheet.
Chemistrybetaintroductory

Chemistry Reference Center

Searchable periodic table and practical references for elements, ions, ionic formulas, solubility rules, acids and bases, activity series, VSEPR shapes, constants, and equations.

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Civil engineering handbook with beam, soil, water, and surveying symbols.
Civil & Structural Engineeringbetaintroductory

Civil Engineering Reference Center

Browse detailed civil and structural references for materials, loads, section properties, soils, hydraulics, surveying, structural concepts, units, and equations.

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Galvanic couple, oxide layer, coating, and degradation curves.
Materials Sciencebetaintermediate

Corrosion & Degradation Workbench

Explore electrochemical corrosion, oxidation, coating life, accelerated aging, fatigue damage, and environmental cracking.

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Logic gates, binary bits, flip-flop, counter waveform, ADC staircase, and PWM pulses.
Electrical Engineeringbetaintroductory

Digital Electronics Workbench

Learn logic gates, Boolean expressions, binary arithmetic, adders, multiplexers, flip-flops, counters, timing, ADCs, DACs, and PWM.

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Aircraft wing with lift, drag, thrust, and weight vectors beside a drag polar and flight envelope.
Aerospace & Rocket Sciencebetaintermediate

Flight Aerodynamics Workbench

Explore standard atmosphere, airspeed, lift, drag, glide, stall, level flight, climb, turns, takeoff, landing, Reynolds number, compressibility, and longitudinal stability.

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Thermal gradient, electric field, magnetic response, and optical attenuation.
Materials Sciencebetaintermediate

Functional Materials Workbench

Explore thermal, electrical, dielectric, magnetic, thermoelectric, and optical material properties.

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An atom, reaction arrow, laboratory flask, pH scale, and molecular geometry diagram.
Chemistrybetaintroductory

General Chemistry Workbench

Sixteen calculators and visual models for atoms, formulas, reactions, gases, solutions, acids and bases, equilibrium, energy, kinetics, electronic structure, geometry, and nuclear decay.

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A mathematical function curve, matrix grid, vector arrow, and calculator symbols on a dark blue workbench.
Mathematicsbetaintroductory

General Mathematics Workbench

Use a scientific calculator, graph functions, solve quadratics, work with vectors and matrices, and handle significant figures, percentages, ratios, and scientific notation.

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Rays refracting through a lens and prism on an optical bench.
Optics & Photonicsbetaintroductory

Geometrical Optics Workbench

Explore refraction, total internal reflection, thin lenses, mirrors, lensmaker calculations, two-lens systems, and prism deviation with unit-labeled diagrams.

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Soil layers, footing, retaining wall, slope, and pile foundation.
Civil & Structural Engineeringbetaintermediate

Geotechnical & Foundations Workbench

Explore effective stress, bearing capacity, settlement, consolidation, earth pressure, slope stability, seepage, and idealized pile resistance.

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Pipe network, open channel, pump, weir, and rainfall runoff graph.
Civil & Structural Engineeringbetaintermediate

Hydraulics & Stormwater Workbench

Calculate continuity, hydraulic head, Reynolds number, pipe losses, open-channel flow, pump power, orifice and weir discharge, and Rational Method runoff.

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Battery, resistor network, capacitor charging curve, and AC response plot for an introductory circuits workbench.
Electrical Engineeringbetaintroductory

Introductory Circuits Workbench

Learn DC and introductory AC circuit analysis through Ohm’s law, power, resistor networks, Kirchhoff’s laws, equivalent circuits, first-order transients, resonance, filters, and resistor color codes.

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Searchable materials cards with a detailed property and selection panel.
Materials Sciencebetaintroductory

Materials Reference Center

Search detailed material classes, crystal structures, defects, processing, testing, failure modes, and units.

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Stress-strain curve, crack, hardness indent, and fatigue trend.
Materials Sciencebetaintermediate

Mechanical Properties & Failure Workbench

Reduce mechanical-test data and explore elasticity, hardness, fatigue, creep, fracture, and strengthening.

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A projectile path, inclined plane, rotating lever, pendulum, and orbit representing the mechanics workbench.
Physicsbetaintroductory

Mechanics Workbench

Fifteen mechanics calculators and simulations covering motion, forces, energy, rotation, oscillations, and gravity.

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Orange light rays refracting through two blue lenses on a dark optical bench.
Optics & Photonicsbetaintermediate

Multi-Stage Lens Ray Simulator

Trace parallel rays through configurable spherical lens surfaces using Snell’s law and inspect focal behavior and spherical aberration.

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A spacecraft traveling on an elliptical transfer orbit between two circular orbits around a planet.
Aerospace & Rocket Sciencebetaintermediate

Orbital Mechanics Workbench

Explore circular and elliptical orbits, vis-viva, transfer maneuvers, rendezvous, launch windows, escape energy, spheres of influence, J2 precession, and synchronous orbits.

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A carbon skeleton, benzene ring, reaction arrow, spectrum, and chromatography plate representing organic chemistry.
Chemistrybetaintermediate

Organic Chemistry Workbench

Twelve guided modules for functional groups, nomenclature, molecular formulas, stereochemistry, conformations, acidity, mechanisms, reactions, spectroscopy, aromaticity, polymers, and chromatography.

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Binary phase diagram, heat-treatment cycle, and microstructure symbols.
Materials Sciencebetaintermediate

Phase Diagrams & Heat Treatment Workbench

Explore phase fractions, transformations, grain growth, case depth, tempering, and hardenability.

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Laser beam entering an optical fiber and photodetector with a resonator trace.
Optics & Photonicsbetaintermediate

Photonics Workbench

Calculate photon energy, Gaussian beam propagation, fiber modes and link budgets, photodetector response, attenuation, optical cavities, and pulsed-laser quantities.

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Polymer chains and aligned fibers with property graphs.
Materials Sciencebetaintermediate

Polymers & Composites Workbench

Explore molecular weight, glass transition, crosslinking, composite density, stiffness, CTE, and load transfer.

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Switching waveform, inductor current, converter block, thermal path, and efficiency bars.
Electrical Engineeringbetaintermediate

Power Electronics Workbench

Analyze linear regulators, buck, boost, buck-boost and flyback converters, switching losses, ripple, thermal paths, and efficiency budgets.

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Cutaway rocket engine and expanding exhaust plume beside a delta-v performance curve.
Aerospace & Rocket Sciencebetaintermediate

Rocket Propulsion Workbench

Explore thrust, specific impulse, rocket delta-v, burn time, engine clusters, nozzle expansion, altitude performance, staging, propellant split, feed power, and thrust-time profiles.

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Diode curve, transistor symbol, MOSFET characteristic curves, and thermal path.
Electrical Engineeringbetaintermediate

Semiconductor Devices Workbench

Learn diode, Zener, LED, rectifier, BJT, MOSFET, transistor-switching, and semiconductor thermal behavior through guided operating-point models.

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A simply supported beam above its shear force and bending moment diagrams.
Mechanicalbetaintermediate

Statics and Strength of Materials Workbench

Sixteen modules covering free-body diagrams, support reactions, method of joints, section properties, shear and moment diagrams, bending and shear stress, axial load, torsion, thermal stress, principal stresses, combined loading, pressure vessels, factor of safety, and column buckling.

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Beam, truss, shear diagram, and bending-moment curve for a structural analysis workbench.
Civil & Structural Engineeringbetaintermediate

Structural Analysis Workbench

Analyze beam reactions, shear and moment, elastic deflection, section properties, truss forces, column buckling, and combined stress.

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Structural cross-section with bending stress, torsion, bolts, and welds.
Civil & Structural Engineeringbetaintermediate

Structural Member Mechanics Workbench

Calculate member stresses, deformations, torsion, thermal restraint, eccentric loading, simplified bolt and weld demands, bearing stress, and utilization.

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Survey tripod, traverse points, road curve, profile, and site grading contours.
Civil & Structural Engineeringbetaintroductory

Surveying & Site Development Workbench

Calculate coordinate geometry, bearings, traverse closure, leveling, grades, curves, plan areas, earthwork volumes, station interpolation, and cross slopes.

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A calorimeter, reaction-energy curve, flame, and heating curve representing thermochemistry.
Chemistrybetaintermediate

Thermochemistry Workbench

Guided thermochemistry lessons for calorimetry, formation enthalpy, Hess’s law, bond energies, heating curves, entropy, Gibbs energy, catalysts, fuels, and temperature corrections.

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A piston chamber, heat-engine arrows, layered wall, and thermal radiation curve.
Physicsbetaintermediate

Thermodynamics Workbench

Nine calculators and visualizations for ideal gases, heat capacity, expansion, engines, entropy, conduction, thermal radiation, and phase changes.

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Interference fringes and diffracted light waves across a dark optical bench.
Optics & Photonicsbetaintermediate

Wave Optics Workbench

Simulate interference, diffraction, gratings, thin films, polarization, optical resolution, and coherence with unit-labeled graphs.

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A sound wave, standing-wave pattern, and expanding acoustic wavefronts.
Physicsbetaintermediate

Waves and Sound Workbench

Calculate and visualize wave propagation, Doppler shift, standing waves, resonance, sound levels, beats, and acoustic impedance.

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Subjects

Categories remain visible as the tool library grows.

Mathematics

Numerical methods, algebra, geometry, statistics, and unit-aware calculations.

2 tools

Physics

Mechanics, waves, thermodynamics, fields, and foundational physical models.

4 tools

Chemistry

Atoms, reactions, solutions, equilibrium, thermochemistry, and chemical reference tools.

6 tools

Optics & Photonics

Geometrical optics, wave optics, imaging, lasers, fiber systems, detectors, and photonic devices.

4 tools

Electrical Engineering

Circuits, signals, power, electronics, electromagnetic systems, and electrical design calculations.

8 tools

Aerospace & Rocket Science

Rocket propulsion, launch vehicles, orbital mechanics, aerodynamics, spacecraft systems, and flight calculations.

3 tools

Materials Science

Crystal structure, mechanical behavior, phase transformations, polymers, composites, functional properties, corrosion, processing, and materials selection.

7 tools

Mechanical

Statics, dynamics, machine design, fluids, heat transfer, and materials.

2 tools

Civil & Structural Engineering

Structural analysis, member mechanics, geotechnical engineering, foundations, hydraulics, stormwater, surveying, and site development.

6 tools