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Delisles to Réaumurs Converter (°De to °Ré)

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Live Conversion • BIPM SI Brochure (9th Edition) Certified
1 Delisle = 79.46666667 Réaumur
1 °De = 79.466667 °Ré • 1 °Ré = 148.125 °De
Delisle to Réaumur: One Delisle is equal to 79.46666667 Réaumurs.
Certified Authority Value
79.46666667
°Ré
Exact: 1 °Ré ≡ 148.125 °De
°De
°De
Swap to Réaumur to Delisle
°Ré
°Ré 79.46666667
Quick Values:
-40 °De 0 °De 10 °De 20 °De 37 °De 50 °De 100 °De 200 °De 500 °De
Conversion Formula
To convert Delisle to Réaumur, convert to Celsius and then to Réaumur
°De → °C → °Ré

Calculation: 1 °De = 79.46666667 °Ré

Common Delisle to Réaumur Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Delisle (°De) and Réaumur (°Ré).

Tap any row to calculate
Réaumur to Delisle: Reciprocal Summary
Réaumur to Delisle Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
0 °Ré is equal to 150 °De (Delisle) 1.5 × 10²
20 °Ré is equal to 112.5 °De (Delisle) 1.125 × 10²
37 °Ré is equal to 80.625 °De (Delisle) 8.062 × 10¹
100 °Ré is equal to -37.5 °De (Delisle) -3.75 × 10¹
500 °Ré is equal to -787.5 °De (Delisle) -7.875 × 10²
View Complete 15-Row Réaumur to Delisle Table

Real-World Context & Everyday Benchmarks

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To help contextualize these units in everyday life, science, and engineering, here are verified real-world reference points for Delisle (°De) and Réaumur (°Ré):

Delisle References:

  • Water boiling point temperature in historical Delisle scale 0 °De
  • Water freezing point temperature in inverted Delisle scale 150 °De

Réaumur References:

  • Water freezing point temperature in traditional Réaumur scale 0 °Ré
  • Water boiling point temperature in traditional Réaumur scale 80 °Ré

Tap any benchmark above to automatically calculate its exact equivalent in Réaumur.

ISQ Dimension: [Θ] Coherent SI Unit: kelvin (K) Thermodynamics & Heat Transfer

How to Convert Delisle to Réaumur

Converting Delisle (°De) to Réaumur (°Ré) is a core calculation in Thermodynamic Temperature, which quantifies the thermal energy and average microscopic kinetic energy of particles within a physical system. Converting between these temperature scales requires calibrating both the incremental degree size and the thermodynamic reference baseline.

Direct Factor1 °De = 79.466667 °Ré
Inverse Ratio1 °Ré = 148.125 °De
Conversion ScaleNon-Linear Affine Offset & Interval Scale
First-Principles SI Derivation ProofNIST SP 811 / ISO 80000 Compliance

Mathematical Conversion Derivation via Coherent SI Base Unit

Under the International System of Quantities (ISQ), dimensional conversion between non-SI units is rigorously resolved by bridging through the coherent SI base unit (kelvin (K)) without arbitrary rounding:

Vtarget=Vsource×(ksource→SIktarget→SI)V_{\text{target}} = V_{\text{source}} \times \left( \frac{k_{\text{source} \to \text{SI}}}{k_{\text{target} \to \text{SI}}} \right)
Universal Dimensional Conversion Law (ISO 80000 / NIST SP 811)
1. Source SI Bridge (ksource):1 °De = 1 kelvin (K)
2. Target SI Bridge (ktarget):1 °Ré = 1 kelvin (K)
Step-by-step substitution for Delisle → Réaumur:V(°Ré) = V(°De) × ( 1 / 1 ) = V(°De) × 79.466667
Mathematical FormulaValue in Réaumur = Value in Delisle × 79.46666667Direct computational formula applied for standard conversion.
Worked Example

Evaluating an input of 12 Delisle (°De) produces 73.6 Réaumur (°Ré). In heavy-duty utility and industrial workloads, 480 °De equals -176 °Ré.

Inverse check: 1 °Ré = 148.125 °De.

Understanding Delisle and Réaumur

Delisle

°De
Standard Unit

A Delisle (°De) is a recognized unit for thermodynamic temperature.

Applications & Practical Context

In practical temperature terms, a water boiling point temperature in historical Delisle scale equals 0 °De, a water freezing point temperature in inverted Delisle scale equals 150 °De.

Physical Setup

A reading of 1 °De represents a thermal intensity calibrated relative to the thermodynamic reference scale.

Conversion to SI Unit: kelvin (K)
1 °De = 1 K

Réaumur

°Ré
Standard Unit

A Réaumur (°Ré) is a recognized unit for thermodynamic temperature.

Applications & Practical Context

In practical temperature terms, a water freezing point temperature in traditional Réaumur scale equals 0 °Ré, a water boiling point temperature in traditional Réaumur scale equals 80 °Ré.

Physical Setup

A reading of 1 °Ré represents a thermal intensity calibrated relative to the thermodynamic reference scale.

Conversion to SI Unit: kelvin (K)
1 °Ré = 1 K

Domain Metrology & Engineering Applications

Governing Law & Equation

Zeroth Law of Thermodynamics & Boltzmann Constant (k_B ≡ 1.380649 × 10⁻²³ J/K)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using standard platinum resistance thermometers (SPRT / Pt100), optical radiation pyrometers, and calibrated thermocouples.

Primary Industry Sectors

Applied across thermal power plants, semiconductor wafer furnaces, pharmaceutical cold chains, and cryogenic gas processing under international metrology standard BIPM SI Brochure (9th Edition), CODATA 2022.

Physical Orders of Magnitude & Laboratory Reference Benchmarks

Physical Phenomenon / Engineering ReferenceReference ValueConverted to Réaumur
Water boiling point temperature in historical Delisle scale0 °De80 °Ré
Water freezing point temperature in inverted Delisle scale150 °De0 °Ré
Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the BIPM SI Brochure (9th Edition), CODATA 2022. Governed by Zeroth Law of Thermodynamics & Boltzmann Constant (k_B ≡ 1.380649 × 10⁻²³ J/K) under ISO 80000 dimensional vector [Θ].

Multi-Variable Engineering Bridge Thermodynamics & Heat Exchanger Transfer

Thermal Expansion & Heat Load Bridge (mm Growth • BTU • Joules • kWh • W/(m·K) • °C / °F)

Calculate linear structural elongation ΔL = α × L₀ × ΔT or total thermodynamic enthalpy change Q = m × cp × ΔT across architectural alloys and process fluids.

ΔL = α × L₀ × ΔT
Live Calculated Bridge Equivalent:
1 °De at Structural Carbon Steel (ASTM A36) = 0.12 mm
Equals 0.012 cm • 0.004724 in • 120 μm
Elongation on 10m
0.12
mm
Millimeters
Structural Gap
0.012
cm
Centimeters
US Architectural
0.004724
in
Inches
Precision Machining
120
μm
Micrometers
Heat Load (100kg steel)
0.00056
BTU
British Thermal Units
Enthalpy (100kg steel)
0.00059
kJ
Kilojoules
  1. 1. Normalize Input to SI Base Unit (K):
    ΔT = 1 °De × 1 = 1 K
  2. 2. Apply Engineering Parameter (α):
    Selected condition: Structural Carbon Steel (ASTM A36) at α = 1.2 × 10⁻⁵ 10⁻⁶ / °C
  3. 3. Execute Governing Physical Law in SI Units:
    ΔL = α × L₀ × ΔT = (1) × (1.2 × 10⁻⁵) = 1.2 × 10⁻⁵ m
  4. 4. Convert to Standard Engineering Units:
    • mm: 1.2 × 10⁻⁵ × 10000 = 0.12 mm (Millimeters) • cm: 1.2 × 10⁻⁵ × 1000 = 0.012 cm (Centimeters) • in: 1.2 × 10⁻⁵ × 393.7008 = 0.004724 in (Inches) • μm: 1.2 × 10⁻⁵ × 1 × 10⁷ = 120 μm (Micrometers) • BTU: 1.2 × 10⁻⁵ × 46.45 = 0.00056 BTU (British Thermal Units) • kJ: 1.2 × 10⁻⁵ × 49 = 0.00059 kJ (Kilojoules)
Explore Full Thermal Expansion Converter →
Engineering Substance / Operating Standard Parameter Value (10⁻⁶ / °C) Reference State / Condition Typical Industrial & Engineering Application
Structural Carbon Steel (ASTM A36) 1.2 × 10⁻⁵ α = 12.0 × 10⁻⁶ / °C Railroad tracks, bridges & structural framework
Austenitic Stainless Steel (304 / 316) 1.73 × 10⁻⁵ α = 17.3 × 10⁻⁶ / °C Sanitary chemical piping & boiler vessels
Structural Aluminum (6061-T6) 2.31 × 10⁻⁵ α = 23.1 × 10⁻⁶ / °C Façade curtain walls & aerospace structural skins
Pure Copper (C11000) 1.65 × 10⁻⁵ α = 16.5 × 10⁻⁶ / °C Domestic plumbing pipes & electrical busbars
Reinforced Concrete (Civil Standard) 1.2 × 10⁻⁵ α = 12.0 × 10⁻⁶ / °C Matched to steel to prevent joint spalling
Architectural Plate Glass 8.5 × 10⁻⁶ α = 8.5 × 10⁻⁶ / °C Building window glazing & solar panels
Invar 36 (Ultra-Low Expansion Nickel Alloy) 1.2 × 10⁻⁶ α = 1.2 × 10⁻⁶ / °C Optical benches, laser resonators & shadow masks
Cartridge Brass (70/30 Cu-Zn) 1.99 × 10⁻⁵ α = 19.9 × 10⁻⁶ / °C Plumbing valves, fittings & musical instruments
Rigid PVC Plastic Piping 5.4 × 10⁻⁵ α = 54.0 × 10⁻⁶ / °C Drain-waste-vent piping expansion loops
Titanium Alloy (Grade 5) 8.6 × 10⁻⁶ α = 8.6 × 10⁻⁶ / °C Supersonic aircraft frames & turbine blades
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Frequently Asked Questions

There are exactly 79.46666667 réaumurs (°Ré) in 1 delisle (°De). To calculate larger amounts manually, simply multiply your total number of delisles by the conversion multiplier of 79.46666667.

The mathematical formula to convert delisles to réaumurs is: [value] * 79.46666667 = réaumurs. Rather than doing the math manually, you can use our high-precision online calculator to process this exact equation instantly without rounding errors.

To perform the reverse calculation from réaumurs back to delisles, you must divide your starting value by 79.46666667. Our bidirectional tool automatically computes this inverse equation the moment you type into the réaumur input field.

A temperature of 1 Delisle corresponds to 79.4667 Réaumur. In terms of incremental temperature steps, a 1-degree change in Delisle equals a 0.5333-degree change in Réaumur.

A typical water boiling point temperature in historical Delisle scale measures 0 °De, which corresponds to 80 Reaumur (Réaumur).