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#' Universal Constants
#'
#' This data set provides various universal constants
#'
#' @format
#' A data frame containing for each universal constant the following information.
#' \describe{
#' \item{\code{Quantity}}{a character vector containing a short description of the constants.}
#' \item{\code{Value}}{a numeric vector containing the value of the constants.}
#' \item{\code{Unit}}{a character vector indicating the unit of the constants.}
#' }
#'
#' @source
#' http://www.ebyte.it/library/educards/constants/ConstantsOfPhysicsAndMath.html
#'
#' @examples
#' # Data for the speed of light
#' universalConstants["c",]
#'
#' # Return the speed of light in m.s-1
#' universalConstants["c","Value"]
#'
#' # Return the Planck constant in J.s
#' universalConstants["h","Value"]
#'
#' @keywords datasets
#'
#' @name universalConstants
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