Spatium: Classical Physics with a Modern Spin

This paper presents a framework in which electromagnetism and gravity arise through interaction between matter and a continuous physical medium, Spatium, which supports waves and interference. Spatium has an effective pressure. Matter attracts/repels Spatium which resists via its effective pressure; this induces gradients in Spatium. These gradients generate forces on other matter which manifest as electromagnetism and gravity. In an atom, a stable hadron is a compact matter-Spatium dynamic system which acts as a central periodic driver sustaining a standing-wave in its surrounding medium with a fixed nodal structure. The nodal structure consists of zero-amplitude surfaces with intersecting curves along which electrons are naturally guided and discrete stagnation points at the intersection of these curves where electrons may be captured. Because electrons are captured at fixed locations of definite radii from the central driver, the Coulomb energy appears directly as the interaction between point-charges separated by definite physical distances—without appeal to probability clouds or state collapse. The geometry of the atomic standing-wave nodal pattern fixes where motion can occur; static external magnetic fields set labels and work is supplied by time‑dependent drives and photons. A single‑source energy-work ledger connects these mechanisms to observed spectra, including Penning ratios, Zeeman patterns, and hydrogen-like ladders.