In a Roman bath complex, a caldarium was a room with a hot plunge bath. This area was heated by a hypocaust, an underfloor heating system that used hot air tunnels managed by workers, creating a highly hot and steamy atmosphere. In the standard order of bathing rooms, this was the hottest one; bathers would proceed from the caldarium to the frigidarium via the tepidarium. A hot water bath submerged in the floor may be found in the caldarium, and occasionally a laconicum—a hot, dry place designed to induce sweating—was also present. The clients of the bath would apply olive oil to their bodies, scrubbing away any excess with a strigil to cleanse themselves. Occasionally, this was discarded for the workers to pick up off the floor or replaced in the pot so that the women may use it to style their hair. Although the actual temperature of the caldarium is unknown, it could not have been greater than 50–55 °C because the Romans wore sandals with wooden soles. #History
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