{"aspect_id":"AS167","aspect_name":"power-density","aspect_reference":null,"aspect_symbol":null,"name":"power-density British thermal unit (th) per square foot second","scale_id":"SC961","scale_name":null,"scale_symbol":null,"scale_type":"ratio","symbol":null,"unit_id":"UN1002","unit_name":"British thermal unit (th) per square foot second","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}.(ft2.s)-1"}