The textbook by Santillana is a widely used resource in Spain for second-year secondary education. It is currently published under several projects, most notably the Serie Investiga (Saber Hacer) and the more recent Proyecto Construyendo Mundos . Accessing Digital Content

The current curriculum for 2º ESO focuses on several core scientific areas:

Properties, states (solids, liquids, gases), and the kinetic theory.

https://www.santillana.es/digital/ or https://evocacion.es/

Si tu colegio no te ha proporcionado el acceso digital o tu código ha caducado, no entres en páginas piratas. En su lugar:

Santillana books are famous for their "Factor de conversión" tables. If you find a PDF, go directly to the unit on "Magnitudes y Unidades". Use the link to download the interactive "Calculadora de conversiones" if available.