{"aspect_id":"AS151","aspect_name":"pressure-ratio-","aspect_reference":null,"aspect_symbol":null,"name":"pressure-ratio- parts per million","scale_id":"SC1358","scale_name":null,"scale_symbol":null,"scale_type":"ratio","symbol":"None ppm","unit_id":"UN1270","unit_name":"parts per million","unit_reference":null,"unit_symbol":"ppm"}