phys_consts = {
    "avogadro":
        {
            "name": "Avogadro constant",
            "symbol": "N_A",
            "value": 6.02214076e23,
            "unit": "mol^-1"
        },

    "coulomb":
        {
            "name": "Coulomb constant",
            "symbol": "k_e",
            "value": 8.9875517923e9,
            "unit": "N.m^2.C^-2"
        }
}