Chemical Units
Chemical Unit Converter Hub
Convert pressure, temperature, concentration, viscosity, and volume instantly. Clear assumptions, formula view, copy, and history keep results reliable.
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Assumption Notes
- Approx mode assumes representative values (e.g., aqueous solution ρ = 1.000 kg/L) for quick estimates.
- Precise mode uses input conditions such as density; results vary by temperature and composition.
- This tool treats ppm as mass fraction by default: ppm (w/w) = mg/kg.
Category
الإدخال
الإخراج
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Rounding and locale apply to the top value.
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Common units in this category
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خيارات
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Recent conversions
Common Conversions
Common conversions for quick reference.
bar → psi
psi = bar × 14.5037738
1 bar equals 100,000 Pa.
ppm (w/w) → mg/L
mg/L = ppm × ρ (kg/L)
Approx mode uses ρ = 1.000 kg/L.
cP → mPa·s
1 cP = 1 mPa·s
Dynamic viscosity only.
°C → K
K = °C + 273.15
K cannot be below 0.
US gal → L
L = US gal × 3.785411784
Imperial gal differs from US gal.
Definitions & Notes
Short definitions and caution points for each category.
Pressure
- Pa is the SI unit. bar and atm are common in industrial specs.
- psi is used in US-based equipment.
الحرارة
- Conversions include offsets (°C, °F, K).
- K must be 0 or above (absolute zero).
Concentration
- ppm here means mass fraction (ppm w/w = mg/kg).
- mg/L depends on density; use Precise mode if conditions vary.
Viscosity
- Dynamic viscosity uses Pa·s, mPa·s, cP.
- Kinematic viscosity uses m²/s, mm²/s, cSt.
- Converting between dynamic and kinematic viscosity requires density: ν = μ / ρ.
الحجم
- US gal and Imperial gal are different.
الأسئلة الشائعة
Do ppm ↔ mg/L conversions require density?
Yes. ppm (mass fraction: mg/kg) to mg/L (mass/volume) requires density. Approx mode assumes ρ = 1.000 kg/L for aqueous solutions; Precise mode uses your input density.
Are US units supported?
Yes. Pressure supports psi, temperature supports °F, volume supports US gal, and more.
Can I save conversion history?
Yes. History can be saved in your browser (LocalStorage) and can be turned off.
Tool Assumptions
Summary of tool assumptions
- This tool is a calculation aid and does not replace design codes, regulations, contracts, or safety requirements.
- Preset values are examples only and can vary by conditions.
- ppm is treated as mass fraction (ppm w/w = mg/kg) by default.