Online Energy Units Converter
How to Convert from Calorie (th) [cal (th)] to Attojoule [aJ]
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How to Convert from Calorie (th) [cal (th)] to Attojoule [aJ]

Learn how to convert energy values from the historical thermochemical calorie (cal (th)) to the ultra-small SI unit attojoule (aJ) using a precise large-scale conversion factor.

Please check your input. It must be a valid numeric value.

Calorie (th) [cal (th)] to Attojoule [aJ] Conversion Table

Calorie (th) [cal (th)] Attojoule [aJ]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.
Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.
Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.
Calorie (th) [cal (th)] to Attojoule [aJ] Conversion Table
Calorie (th) [cal (th)] Attojoule [aJ]

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What Is This Tool?

This tool enables conversion of energy units from calorie (th), a historical unit used in thermochemistry, to the attojoule, an SI-derived unit for very small energy quantities relevant at the atomic and molecular scale.

How to Use This Tool?

  • Enter the energy value in calorie (th).
  • Select calorie (th) as the input unit and attojoule as the output unit.
  • Click convert to get the corresponding energy in attojoules.

Key Features

  • Converts between calorie (th) and attojoule with exact predefined conversion factor.
  • Supports translation of classical thermochemical data into modern quantum energy scales.
  • Browser-based and easy to use with no installation required.

Examples

  • 2 cal (th) converts to 8.368 × 10^18 aJ.
  • 0.5 cal (th) converts to 2.092 × 10^18 aJ.

Common Use Cases

  • Translating older calorimetry measurements to extremely small SI energy units.
  • Analyzing heat and specific heat capacity values from historical thermochemical literature.
  • Applying energy data in nanoscale physics, single-photon detection, and quantum device research.

Tips & Best Practices

  • Use this tool mainly for scientific research that requires bridging classical and quantum energy scales.
  • Handle large numeric conversions carefully to prevent computational overflow.
  • Prefer joules for modern energy measurements while using this conversion for niche applications.

Limitations

  • Calorie (th) is a historical unit rarely used in contemporary measurements.
  • Large conversion factor may cause numerical overflow in basic calculators or some software.
  • Conversions mainly serve specialized fields rather than everyday usage.

Frequently Asked Questions

Why convert from calorie (th) to attojoule?
Converting allows translating historical thermochemical energies into modern SI units relevant to very small scale energy processes in physics and chemistry.

What is the exact conversion factor between cal (th) and aJ?
1 calorie (th) equals 4,184,000,000,000,000,000 attojoules (aJ).

Is calorie (th) commonly used today?
No, calorie (th) is largely historical and replaced by joules in modern practice, with conversions mainly for research or data interpretation.

Key Terminology

Calorie (th) [cal (th)]
A historical energy unit defined exactly as 4.184 joules, used in older thermochemical measurements.
Attojoule [aJ]
An SI-derived energy unit equal to 10^-18 joules, used to express extremely small energies at atomic and molecular levels.

Quick Knowledge Check

Which unit is larger: calorie (th) or attojoule?
What kind of energy scale does attojoule represent?
Why is the calorie (th) unit still converted to attojoule?

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