Radius is an interactive simulation engine for physics, chemistry, and quantum mechanics. Manipulate particles, watch reactions unfold, explore quantum states — all in the browser.
Launch objects at any angle and velocity. Visualize parabolic trajectories with and without air resistance. Measure range, height, and flight time.
Place charges and magnets. Watch electric and magnetic field lines form in real time. See how fields superpose and interact.
Fire individual photons through two slits. Watch the interference pattern build up one particle at a time. Toggle observation to collapse the wave function.
Drag atoms to build molecules. Watch bonds form and break. See electron orbitals, bond angles, and molecular geometry in 3D.
A virtual container of gas molecules. Adjust temperature, pressure, and volume. Watch individual molecules and see the math emerge from chaos.
Visualize qubit states on the Bloch sphere. Apply quantum gates (Hadamard, CNOT, Pauli). Watch superposition and entanglement form.
Drag, drop, adjust parameters, and watch physics happen. Every simulation runs in real time with accurate numerical solvers.
3D molecular rendering with electron density maps, orbital shapes, and bond visualization. All 118 elements in the periodic table.
Bloch sphere visualization, gate operations, entanglement diagrams. See quantum computing concepts that textbooks can only describe.
Every simulation session auto-generates a lab notebook entry. Hypothesis, parameters, observations, and conclusions — ready to submit.
Toggle the equations governing each simulation. See the math update in real time as you change parameters. Theory meets reality.
Runs entirely in the browser using WebGL and WebAssembly. No plugins, no downloads, no Java applets. Works on phones and tablets.
From Newton's laws to quantum entanglement. Every simulation interactive, every equation visible, every experiment repeatable.