Công cụ khoa học

Calculate heat transfer by conduction (Fourier), convection (Newton), radiation (Stefan–Boltzmann), overall U-value, and composite wall assemblies. Enter geometry, temperatures, and material properties — get heat rate in W, kW, and BTU/hr with thermal resistance. Metric and imperial units. Free, browser-based.

Interactive periodic table with element details, atomic mass, and electron configuration for all 118 elements.

Charles' law calculator free — solve V1/T1=V2/T2 for volume or temperature at constant pressure. K, °C, L, mL. No signup.

Find the moon phase for any date — new moon, full moon, quarters, and crescents. Shows illumination %, moon age, and days to next new or full moon. Free, browser-based.

Predict child blood types from parent ABO and Rh types — Punnett squares, probabilities, and combined outcomes like A+ or O−. Free, instant, browser-based.

Find your weight on Mercury, Venus, Mars, Jupiter, the Moon, and other worlds. Enter Earth weight in kg or lb and compare surface gravity instantly. Free, browser-based.

Calculate population growth with exponential and logistic models — solve for N, growth rate r, time, or N₀ with projections and doubling time. Free, browser-based.

Normality calculator free — convert N, molarity, and equivalents per mole. Find normality from mass and volume. Chemistry titration prep in your browser.

Combined gas law calculator free — solve P1V1/T1=P2V2/T2 for any unknown. Pressure, volume, temperature units. No signup.

Simulate DNA/RNA mutations — substitutions, insertions, deletions, and seeded random SNPs with highlighted output and mutation log. Free, browser-based.

Find codons in RNA or DNA — search AUG, stop codons, scan reading frames, and view codon frequencies. Free, instant, browser-based.

Calculate safety factor, margin of safety, and utilization from strength and stress or load and capacity. Modes: SF from stress, SF from load, allowable stress, required strength, and design pass/fail check. Material yield presets. Metric (MPa, kN) and imperial (ksi, lbf). Free, browser-based.