{"dataset_version":"2026-09-21","source":"curated_engineering_density_reference","count":33,"data":[{"key":"steel_mild","name":"Mild steel","category":"metal","density":7850,"unit":"kg/m3","note":"typical engineering value"},{"key":"steel_stainless","name":"Stainless steel","category":"metal","density":8000,"unit":"kg/m3","note":"typical alloy range center"},{"key":"aluminium","name":"Aluminium","category":"metal","density":2700,"unit":"kg/m3","note":"typical pure aluminium value"},{"key":"copper","name":"Copper","category":"metal","density":8960,"unit":"kg/m3","note":"typical room-temperature value"},{"key":"brass","name":"Brass","category":"metal","density":8500,"unit":"kg/m3","note":"typical alloy value"},{"key":"bronze","name":"Bronze","category":"metal","density":8800,"unit":"kg/m3","note":"typical alloy value"},{"key":"lead","name":"Lead","category":"metal","density":11340,"unit":"kg/m3","note":"typical room-temperature value"},{"key":"zinc","name":"Zinc","category":"metal","density":7140,"unit":"kg/m3","note":"typical room-temperature value"},{"key":"titanium","name":"Titanium","category":"metal","density":4500,"unit":"kg/m3","note":"typical room-temperature value"},{"key":"gold","name":"Gold","category":"metal","density":19300,"unit":"kg/m3","note":"typical room-temperature value"},{"key":"silver","name":"Silver","category":"metal","density":10490,"unit":"kg/m3","note":"typical room-temperature value"},{"key":"concrete_normal","name":"Concrete, normal weight","category":"masonry","density":2400,"unit":"kg/m3","note":"typical construction value"},{"key":"brick_common","name":"Common brick","category":"masonry","density":1700,"unit":"kg/m3","note":"typical construction value"},{"key":"limestone","name":"Limestone","category":"stone","density":2180,"unit":"kg/m3","note":"typical building stone value"},{"key":"marble","name":"Marble","category":"stone","density":2500,"unit":"kg/m3","note":"typical building stone value"},{"key":"granite","name":"Granite","category":"stone","density":2700,"unit":"kg/m3","note":"typical building stone value"},{"key":"glass_soda_lime","name":"Soda-lime glass","category":"glass","density":2500,"unit":"kg/m3","note":"typical glass value"},{"key":"water_fresh","name":"Fresh water","category":"liquid","density":1000,"unit":"kg/m3","note":"near 4 C maximum density rounded"},{"key":"seawater","name":"Seawater","category":"liquid","density":1030,"unit":"kg/m3","note":"typical salinity rounded"},{"key":"cooking_oil","name":"Cooking oil","category":"liquid","density":920,"unit":"kg/m3","note":"typical range center"},{"key":"mercury","name":"Mercury","category":"liquid_metal","density":13595,"unit":"kg/m3","note":"near room-temperature value"},{"key":"oak","name":"Oak","category":"wood","density":710,"unit":"kg/m3","note":"approximate seasoned wood value"},{"key":"pine","name":"Pine","category":"wood","density":500,"unit":"kg/m3","note":"approximate seasoned wood value"},{"key":"timber_general","name":"Timber, general","category":"wood","density":600,"unit":"kg/m3","note":"planning value; species and moisture vary"},{"key":"plywood","name":"Plywood","category":"wood","density":600,"unit":"kg/m3","note":"typical sheet material value"},{"key":"cork","name":"Cork","category":"wood","density":240,"unit":"kg/m3","note":"approximate value"},{"key":"abs_plastic","name":"ABS plastic","category":"plastic","density":1050,"unit":"kg/m3","note":"typical polymer value"},{"key":"polycarbonate","name":"Polycarbonate","category":"plastic","density":1200,"unit":"kg/m3","note":"typical polymer value"},{"key":"acrylic","name":"Acrylic PMMA","category":"plastic","density":1180,"unit":"kg/m3","note":"typical polymer value"},{"key":"expanded_polystyrene","name":"Expanded polystyrene insulation","category":"insulation","density":25,"unit":"kg/m3","note":"typical low-density range center"},{"key":"glass_wool","name":"Glass wool insulation","category":"insulation","density":12,"unit":"kg/m3","note":"typical low-density value"},{"key":"rockwool","name":"Rock wool slab","category":"insulation","density":24,"unit":"kg/m3","note":"typical slab value"},{"key":"air_sea_level","name":"Air at sea level","category":"gas","density":1.225,"unit":"kg/m3","note":"dry air near 15 C at 1 atm"}]}