/usr/share/kde4/apps/kcalc/scienceconstants.xml is in kcalc 4:4.14.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<list_of_constants version="1">
<constant name="Pi" symbol="π" category="mathematics" value="3.14159265358979323846264338327950288419">
<description>
</description>
</constant>
<constant name="Euler Number" symbol="e" category="mathematics" value="2.71828182845904523536028747135266249775">
<description>
</description>
</constant>
<constant name="Golden Ratio" symbol="φ" category="mathematics" value="1.61803398874989484820458683436563811">
<description>
</description>
</constant>
<constant name="Light Speed" symbol="c" category="electromagnetism" value="2.99792458e8">
<description>
</description>
</constant>
<constant name="Planck's Constant" symbol="h" category="nuclear" value="6.6260693e-34">
<description>
</description>
</constant>
<constant name="Gravitational Constant" symbol="G" category="gravitation" value="6.6742e-11">
<description>
</description>
</constant>
<constant name="Earth Acceleration" symbol="g" category="gravitation" value="9.80665">
<description>
</description>
</constant>
<constant name="Elementary Charge" symbol="e" category="nuclear" value="1.60217653e-19">
<description>
</description>
</constant>
<constant name="Elementary Charge" symbol="e" category="electromagnetism" value="1.60217653e-19">
<description>
</description>
</constant>
<constant name="Impedance of Vacuum" symbol="Z₀" category="electromagnetism" value="376.730313461">
<description>
</description>
</constant>
<constant name="Fine-Structure Constant" symbol="α" category="nuclear" value="7.297352568e-3">
<description>
</description>
</constant>
<constant name="Permeability of Vacuum" symbol="μ₀" category="electromagnetism" value="1.2566370614e-6">
<description>
</description>
</constant>
<constant name="Permittivity of Vacuum" symbol="ε₀" category="electromagnetism" value="8.854187817e-12">
<description>
</description>
</constant>
<constant name="Boltzmann Constant" symbol="k" category="thermodynamics" value="1.3806505e-23">
<description>
</description>
</constant>
<constant name="Atomic Mass Unit" symbol="1u" category="thermodynamics" value="1.66053886e-27">
<description>
</description>
</constant>
<constant name="Molar Gas Constant" symbol="R" category="thermodynamics" value="8.314472">
<description>
</description>
</constant>
<constant name="Stefan-Boltzmann Constant" symbol="σ" category="thermodynamics" value="5.670400e-8">
<description>
</description>
</constant>
<constant name="Avogadro's Number" symbol="N_A" category="thermodynamics" value="6.0221415e23">
<description>
</description>
</constant>
</list_of_constants>
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