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Thermal Capacity

kJ/KtomJ/K

Convert kilojoules per kelvin (kJ/K) to millijoules per kelvin (mJ/K).

Factor1 kJ/K = 1000000 mJ/K

Converter

kJ/K

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1.00000e+6mJ/K

Rendered to 6 significant figures.

Formula

Formula
mJ/K = kJ/K × 1000000

Multiply any value in kilojoules per kelvin by 1000000 to obtain the value in millijoules per kelvin.

Worked example

Convert 1 kJ/K to mJ/K.

  1. 01Start with 1 kJ/K.
  2. 02Multiply by the conversion factor: 1 × 1000000 = 1.00000e+6 mJ/K.
Result1 kJ/K = 1.00000e+6 mJ/K

Conversion table

kJ/KmJ/K
11.0000e+6
22.0000e+6
55.0000e+6
101e+7
202e+7
505e+7
1001e+8
2002e+8
5005e+8
10001e+9

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from kJ/K to mJ/K?
1 kJ/K equals 1000000 mJ/K. To convert, multiply the value in kilojoules per kelvin by 1000000.
How do I convert 1 kJ/K to mJ/K?
1 kJ/K = 1.00000e+6 mJ/K. For any value, multiply by 1000000.
How do I convert mJ/K back to kJ/K?
Divide by the same factor — or equivalently, multiply by 1e-6. So 1 mJ/K = 1e-6 kJ/K.
When would I need to convert kilojoule per kelvin to millijoule per kelvin?
Thermal-capacity conversions between kJ/K and mJ/K appear in thermal-mass analysis of bodies, calorimetry, R-C thermal-network modelling, electronics thermal capacitance and large-equipment thermal-storage sizing. J/K and kJ/K are the SI standard; MJ/K and kWh/K cover large-equipment and building thermal-mass notation; BTU/°F is the US convention; cal/K and kcal/K are common in chemistry and thermochemistry. This category is lumped heat capacity only — it does NOT include specific heat capacity (J/(kg·K), requires mass), molar heat capacity (J/(mol·K), requires molecular weight) or volumetric heat capacity, all of which are different physical quantities.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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