{"aspect_id":"AS128","aspect_name":"heat-density","aspect_reference":"NIST SP-811","aspect_symbol":null,"name":"heat-density British thermal unit (th) per cubic foot","scale_id":"SC942","scale_name":null,"scale_symbol":null,"scale_type":"ratio","symbol":null,"unit_id":"UN983","unit_name":"British thermal unit (th) per cubic foot","unit_reference":"https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8#B","unit_symbol":"Btu_{th}.ft-3"}