A square rod (US survey) is a unit of area measurement used in the United States for land surveying and legal property descriptions. It is different from the standard square rod or square pole and is based on the U.S. survey foot, which is a historical unit of length used in land surveying in the United States. The U.S. survey foot is slightly different from the international foot.
One square rod (US survey) is equal to 1/160th of an acre. In terms of area, this is approximately equal to 25.29285264 square meters (m²) or 0.00625 acres.
This unit is used in land-related applications, especially in the United States, where the U.S. survey square rod is employed for legal and historical reasons in land surveys, property descriptions, and land records. It's important to be aware of the specific units being used when dealing with land measurements in the United States to avoid discrepancies or errors.
A "sabin" is a unit used to measure the sound absorption of a material or surface. It quantifies the effectiveness of a material in reducing sound reflections within a room or space. The sabin is named after Wallace Clement Sabine, an American physicist who made significant contributions to the study of architectural acoustics.
One sabin is equivalent to one square foot (approximately 0.0929 square meters) of perfectly sound-absorbing material. In other words, if a material has a sound absorption of 1 sabin per square foot, it means that it absorbs all sound energy that strikes it, and none is reflected.
Architects, acoustical engineers, and designers use the sabin as a measurement to assess and improve the acoustic properties of rooms, such as concert halls, theaters, recording studios, and offices. By selecting materials with known sound absorption coefficients and calculating the total sabin value for a space, they can optimize the acoustic environment to reduce unwanted echoes and noise.