Source of file ChemicalConstants.php

<?php

/**

 * Copyright 2019 University of Liverpool

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

namespace pgb_liv\php_ms\Constant;

/**

 * Static class containing chemical constant values in daltons.

 *

 * @see https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=&all=all

 * @author Andrew Collins

 */

class ChemicalConstants

{

    /**

     * Mass of hydrogen

     *

     * @var double

     */

    const HYDROGEN_MASS = 1.00782503223;

    /**

     * Mass of carbon

     *

     * @var double

     */

    const CARBON_MASS = 12.0;

    /**

     * Mass of nitrogen

     *

     * @var double

     */

    const NITROGEN_MASS = 14.00307400443;

    /**

     * Mass of oxygen

     *

     * @var double

     */

    const OXYGEN_MASS = 15.99491461957;

    /**

     * Mass of phosphorus

     *

     * @var double

     */

    const PHOSPHORUS_MASS = 30.97376199842;

    /**

     * Mass of selenium

     *

     * @var double

     */

    const SELENIUM_MASS = 79.9165218;

}