The National Fire Prevention Association (NFPA) established a rating system to classify and abundant the hazards of a solid. If you have formerly functioned in building you’ve perhaps seen the colorful labels used to clarify these dangers. The yellow diamond, looking at the right side of the brand, transfers REACTIVITY (or constancy) information.
El agua por ser una de las sustancias más abundantes se emplea como base de la comparación. La densidad relativa de un sólido o un líquido se define com....
