806 templates · page 1 of 9
Chemistry & Physics diagram templates
Energy diagrams, circuits, free-body, optics, reaction networks.
Reaction Energy Diagram
Potential-energy profile for a reaction with TS.
Vega-LiteReaction Network
Multi-step reaction network with rate constants.
Graphviz (DOT)Circuit Schematic (SVG)
Battery, resistor, capacitor, switch schematic.
Raw SVGFree-body Diagram (SVG)
Block on an incline with all forces drawn.
Raw SVGWater (XYZ)
Inline XYZ coordinates — ball-and-stick.
3D Molecules (3Dmol)Benzene (XYZ)
Benzene ring rendered as 3D sticks.
3D Molecules (3Dmol)Caffeine (XYZ)
Small-molecule caffeine — 3D ball-and-stick.
3D Molecules (3Dmol)Bohr Atom (SVG)
Stylised Bohr model — nucleus + electron shells.
Raw SVGMolecular Orbital Diagram (SVG)
MO diagram for O₂ — bonding / anti-bonding orbitals with electron pairs.
Raw SVGRetrosynthesis Tree
Retrosynthetic disconnections from a target molecule to commercial precursors.
Graphviz (DOT)SN2 Reaction Mechanism
Walden inversion mechanism — nucleophile, transition state, product.
Raw SVGRetrosynthesis — Aspirin
Aspirin disconnected back to salicylic acid + acetic anhydride.
Graphviz (DOT)MO Diagram — O₂
Molecular orbital diagram showing O₂ paramagnetism via unpaired electrons.
Raw SVGEnzyme Catalysis Cycle
E + S → ES → ES* → EP → E + P, the canonical enzyme cycle.
Graphviz (DOT)Op-Amp — Non-Inverting Amplifier
Schematic of a non-inverting op-amp configuration with gain 1 + Rf/Rg.
Raw SVGFe-Fe₃C Phase Diagram
Iron-carbon equilibrium diagram with eutectic / eutectoid points.
Vega-LiteStress-Strain Curve
Engineering stress-strain with elastic, yield, plastic, fracture regions.
PlotlyCrystal Lattices — BCC / FCC / HCP
Three common metal lattice types with atom positions.
Raw SVGSimply-Supported Beam
Beam with uniform load, reaction forces and bending moment diagram.
Raw SVGReynolds Number Regimes
Laminar / transitional / turbulent flow boundaries with Re thresholds.
MermaidFour-Bar Linkage
Crank-rocker four-bar mechanism with link labels.
Raw SVGFree-Body — Cantilever
Cantilever beam with point load, reaction force and moment.
Raw SVGV-Belt Drive
Two pulleys connected by a V-belt with tight and slack sides labelled.
Raw SVGBode Plot — Low-Pass Filter
Magnitude (dB) and phase (deg) of a first-order RC low-pass filter.
PlotlyRC Charging Curve
Capacitor charging through a resistor — exponential approach to Vs.
PlotlySmith Chart — Matching Concept
Simplified Smith-chart representation of impedance matching via series stub.
Raw SVGEmission vs Absorption Spectra
Continuous / emission / absorption spectra side-by-side bands.
Raw SVGMass Spectrometry Workflow
Sample through ionisation, mass analyser, detector to spectrum.
MermaidUV-Vis Absorption Spectrum
Absorbance vs wavelength with characteristic chromophore peaks.
PlotlyRC low-pass filter
Schematic-style RC low-pass filter — the kind of figure that lives in EE lecture notes.
SVGBob (ASCII)Free-body — block on incline
Classic 30° incline with weight, normal, and friction vectors.
Free-body diagramFree-body — Atwood machine
Two masses on a frictionless pulley, vectors and tension labelled.
Free-body diagramFree-body — cantilever beam
Wall-fixed beam with point load and reaction force/moment.
Free-body diagramFree-body — simple truss joint
Joint analysis at a single pin with three member forces.
Free-body diagramFree-body — projectile in flight
Projectile mid-flight (gravity only; no air resistance).
Free-body diagramFree-body — elevator accelerating up
Passenger inside an elevator with apparent weight increase.
Free-body diagramFree-body — crate being pulled
Crate on a floor with friction and applied force at an angle.
Free-body diagramFree-body — mass-spring system
Mass on a spring, vertical equilibrium.
Free-body diagramFree-body — bridge truss reactions
Simple beam with two pin reactions under distributed load.
Free-body diagramFree-body — car braking
Car decelerating on a flat road with friction and weight.
Free-body diagramFree-body — door hinge moment
Door pushed at the handle — illustrating torque about hinge.
Free-body diagramFree-body — rocket at lift-off
Vertical lift-off: thrust > weight, drag included.
Free-body diagramCircuit — RC low-pass filter
First-order RC low-pass with input source and ground.
Circuit schematicCircuit — LED with current limiter
Resistor + LED powered from 5 V with ground return.
Circuit schematicCircuit — voltage divider
Two-resistor divider with output tap.
Circuit schematicCircuit — op-amp inverting amplifier
Single-supply inverting amplifier with feedback resistor.
Circuit schematicCircuit — NPN switch with base resistor
Classic NPN transistor as a low-side switch.
Circuit schematicP&ID — continuous distillation
Feed tank → pump → column with reboiler + condenser tanks.
P&ID (chemical eng)P&ID — CSTR with cooling
Continuous stirred-tank reactor with cooling jacket and level controller.
P&ID (chemical eng)P&ID — shell-and-tube heat exchanger
Counter-current heat exchanger with TI/FI loop.
P&ID (chemical eng)Logic — half adder
Two-input half adder with XOR (sum) and AND (carry).
Digital logic (gates / K-map / truth table)Logic — SR latch (NAND)
Cross-coupled NAND SR latch.
Digital logic (gates / K-map / truth table)Logic — Karnaugh map (XOR)
2-variable K-map for the XOR function.
Digital logic (gates / K-map / truth table)Logic — Karnaugh map (3-input majority)
Majority function K-map (3 variables).
Digital logic (gates / K-map / truth table)Mechanism — SN1 solvolysis of a tertiary halide
2-Bromo-2-methylpropane in aqueous ethanol: rate-determining heterolysis to the planar tert-butyl cation, fast capture by water, deprotonation to the alcohol — with the first-order rate law, racemisation and the competing E1 path all named.
ScienceMechanism — SN2 with inversion of configuration
Hydroxide on (S)-2-bromobutane in a polar aprotic solvent: backside attack 180° from the C–Br bond, a single concerted transition state with no intermediate, and Walden inversion to (R)-butan-2-ol under a second-order rate law.
ScienceMechanism — E1 elimination and the Zaitsev rule
2-Bromo-2-methylbutane heated in ethanol: slow ionisation to the tertiary carbocation, then loss of a β-hydrogen to a weak base, giving the more substituted Zaitsev alkene as the major product alongside SN1 substitution.
ScienceCatalytic cycle — Suzuki–Miyaura cross-coupling
The four-corner palladium cycle: oxidative addition of the aryl halide, base-driven exchange to the hydroxo complex, transmetalation from the activated boronate, and reductive elimination that releases the biaryl and regenerates Pd(0).
ScienceElectrochemistry — Daniell galvanic cell
Zinc and copper half-cells at 1.00 M joined by a salt bridge: oxidation at the negative anode, reduction at the positive cathode, electrons through the wire, ions through the bridge, and E°cell = +1.10 V with the Gibbs energy it implies.
ScienceTitration — weak acid against strong base
25.00 cm³ of 0.100 M ethanoic acid titrated with 0.100 M NaOH: apparatus, the pH trace, and the four landmarks that matter — the acidic start, the buffer plateau, pH = pKa at half-equivalence, and an equivalence point above pH 7.
ScienceDistillation — continuous ethanol/water column
A trayed fractionating column with rectifying and stripping sections around the feed tray, condenser, reflux drum and steam reboiler — plus the ethanol/water azeotrope that caps the distillate and the molecular sieve that gets past it.
ScienceChromatography — reversed-phase HPLC separation
The full flow path of an RP-HPLC run: degassed aqueous/acetonitrile gradient, autosampler, guard cartridge and thermostatted C18 column into a diode-array detector — with retention factor, plate count and the Rs ≥ 1.5 acceptance rule.
ScienceSpectroscopy — ¹H NMR structure elucidation
From weighing the sample into CDCl₃ to an assigned structure: lock and shim, pulse and acquire the FID, Fourier transform and phase, then read chemical shift, integration and multiplicity, confirming with ¹³C and 2-D experiments.
SciencePolymers — free-radical chain-growth of styrene
AIBN thermolysis at 65 °C through initiation, head-to-tail propagation, chain transfer and the two termination modes, ending at polystyrene with the dispersity each termination route produces and the square-root rate law.
ScienceMaterials — crystal lattice types and packing
Metallic, ionic and covalent-network solids side by side: the four metal packings with their coordination numbers and packing fractions, the classic ionic structure types with their stoichiometric ratios, and diamond against graphite.
SciencePhase diagram — pressure against temperature for water
The three phase fields of water with the boundaries that separate them, the triple and critical points in numbers, the negatively sloping fusion curve that makes ice float, and the supercritical region beyond 374 °C.
ScienceEquilibrium — how an acetate buffer resists pH change
An equimolar ethanoic acid / ethanoate buffer at pH 4.76: the reserves that mop up added acid and added base, Henderson–Hasselbalch, where the capacity is greatest, the working range, and what happens once the reserve runs out.
ScienceGreen chemistry — two routes to ibuprofen compared
The six-step Boots synthesis with its stoichiometric aluminium chloride against the three-step BHC catalytic route: same molecule, roughly double the atom economy, recovered reagents, and far less salt waste to treat.
SciencePhysics — Free-Body Diagram Set (Four Cases)
Four worked free-body diagrams — block at rest, block on a rough incline, accelerating lift, skydiver at terminal velocity — each with forces resolved and the resulting acceleration stated.
SciencePhysics — Ray Path Through a Two-Lens System
Compound microscope ray path: the objective forms a real inverted image inside the eyepiece's focal length, and the eyepiece works as a magnifier to give a virtual final image at the near point.
SciencePhysics — Labelled DC Circuit (Series–Parallel)
A 12 V supply driving R1 in series with a parallel pair, with switch, fuse, ammeter, voltmeter, capacitor and earth labelled and every branch current and voltage worked out.
SciencePhysics — The Electromagnetic Spectrum
All seven bands from radio to gamma with wavelength, frequency and photon energy for each, the visible band expanded into its colours, and the ionising threshold marked.
SciencePhysics — Particle Decay Chain (Cosmic-Ray Air Shower)
A primary cosmic ray's hadronic cascade: pion production, π⁺ → µ⁺ decay, π⁰ → 2γ and the electromagnetic shower, with branching ratios, lifetimes and the conservation laws checked.
SciencePhysics — Two-Source Interference (Young's Double Slit)
Young's double slit with a 633 nm laser, d = 0.25 mm and L = 2.00 m: path difference, the maxima and minima conditions, and a fringe spacing of 5.06 mm worked out.
SciencePhysics — Otto Cycle (Air-Standard, Worked)
The four-process Otto cycle with every state point computed from r = 10 and γ = 1.40: pressures, temperatures, heat in and out, net work and a 60.2 % air-standard efficiency.
ScienceWastewater treatment — screening to tertiary polishing
A municipal works drawn as the unit-process train it is: 6 mm screens and grit removal, primary settlement taking 60% of the suspended solids, an activated-sludge lane at 3000 mg L⁻¹ MLSS with return sludge holding the age at 10 days, nitrification and anoxic denitrification, and sludge to a 35 °C digester whose biogas runs the site.
ScienceGRAFCET — Cleanroom Material Airlock
A pharmaceutical pass-through airlock where the HEPA purge and the UV-C dose run concurrently under a double bar, the doors are interlocked by set and reset actions rather than by wiring alone, and a differential-pressure check diverges alternatively to a quarantine loop when the cascade or the particle count fails.
GRAFCET / SFCLadder - Duplex Pump Duty Alternation
Eight rungs of a duplex sump station with the duty selector on pump B: the same lead/lag branch pair drives both pumps from one alternation bit, so B runs and A stays standby on this scan, the duty counter has reached its 2,000-hour service preset, and the both-pumps-running alarm stays unlatched.
Ladder logic (PLC)Ladder - Batch Mixer Charge and Soak
Nine rungs of a jacketed batch vessel caught 240 s into a 600 s soak: both charge valves have closed on their made weights, the agitator and its soak TON are running, and the batch-done latch on rung 7 is still unpowered - which is exactly why rung 2's seal-in reads that not-yet-written tag as zero and holds the batch on.
Ladder logic (PLC)P&ID — Brewhouse Wort Line
Process and instrumentation for a brewhouse from hot liquor tank through mash, lauter, kettle and whirlpool to the paraflow chiller feeding fermenter 4, with mash temperature and wort flow loops.
P&ID (chemical eng)P&ID — Food Waste Anaerobic Digester
Instrumented flow for a food waste digestion plant from reception and depackaging through pasteurisation and the mesophilic digester to gas holder, booster and biomethane upgrading column.
P&ID (chemical eng)Physics — Kinematics (SUVAT)
The four constant-acceleration equations of motion.
LaTeX (KaTeX)Physics — Newton's Laws & Dynamics
Second law, third law, linear momentum and friction.
LaTeX (KaTeX)Physics — Work, Energy & Power
Work–energy theorem, kinetic and potential energy, power.
LaTeX (KaTeX)Physics — Momentum & Impulse
Momentum, impulse and conservation in collisions.
LaTeX (KaTeX)Physics — Circular & Rotational Motion
Centripetal acceleration, torque, angular momentum.
LaTeX (KaTeX)Physics — Newtonian Gravitation
Universal gravitation, field strength, gravitational potential energy and Kepler's third law.
LaTeX (KaTeX)Physics — Simple Harmonic Motion
Defining equation, displacement, mass–spring and pendulum periods.
LaTeX (KaTeX)Physics — Waves & Sound
Wave equation, travelling wave, wavenumber and Doppler shift.
LaTeX (KaTeX)Physics — Laws of Thermodynamics
First and second laws, expansion work and Carnot efficiency.
LaTeX (KaTeX)Physics — Ideal Gas & Kinetic Theory
Ideal gas law, mean kinetic energy and rms speed.
LaTeX (KaTeX)Physics — Electrostatics
Coulomb's law, field, potential and Gauss's law.
LaTeX (KaTeX)Physics — DC Circuits
Ohm's law, power dissipation, series and parallel resistance.
LaTeX (KaTeX)Physics — Magnetism & Induction
Lorentz force, force on a current, Faraday's and Ampère's laws.
LaTeX (KaTeX)Physics — Maxwell's Equations
The four Maxwell equations in differential form.
LaTeX (KaTeX)Physics — Geometric Optics
Thin-lens equation, magnification, Snell's law and critical angle.
LaTeX (KaTeX)Physics — Special Relativity
Lorentz factor, time dilation, length contraction, mass–energy.
LaTeX (KaTeX)Physics — Quantum Foundations
Planck relation, de Broglie wavelength, photoelectric effect, uncertainty.
LaTeX (KaTeX)Physics — The Schrödinger Equation
Time-dependent and time-independent forms; particle in a box.
LaTeX (KaTeX)Physics — Nuclear & Radioactivity
Exponential decay, half-life, mass–energy and activity.
LaTeX (KaTeX)