Fotos

Siglo VII
En la India se inicia el cálculo con números negativos, así como la ubicación de los números en posiciones definitivas.La cultura árabe desarrolla un grado alto de algunos procesosquímicos como la obtención de ácido sulfúrico, del ácido nítrico, etc.También se realizan estudios sobre el proceso de la evaporación, condensación, sublimación, etc.
En China se emplea un tipo de imprentaconstituida por caracteres independientes.
Siglo IX
Se hacen los primeros relojes de pesas con engranajes.En el año 880, un médico árabe construye la primera máquina voladora, sin éxito.En China sedocumentan los primeros molinos de viento, el empleo de la pólvora en pirotecnia y el teléfono de hilo.Los árabes experimentan sobre la cámara oscura como principio de lo que después será la fotografía(más tarde Leonardo da Vinci perfeccionará su estudio) y se usarán las funciones trigonométicas.
Siglo XI
Se construye en China el primer reloj de agua de precisión con un error inferior a minuto ymedio diario.
El mundo árabe sigue siendo hegemónico en el desarrollo de las matemáticas resolviendose potencias de binomios como (a + b) elevado al cuadrado. También se establece la densidad de losmateriales, comparándola con la del agua y se usan cámaras refrigeradas para la conservación de los alimentos.
En Europa se impone la arquitectura románica. En el ámbito industrial se desarrolla lafabricación de vidrio plano y se comienza a usar la hulla como combustible. Se observa la orientación de los puntos cardinales por medio de una aguja imantada. En Inglaterra se establece como medidapatrón de longitud la yarda, lo que se considera el comienzo de la separación entre el sistema métrico y el anglosajón.
Siglo XIII
En China se usan bolas de acero cargadas con pólvora como bombas ytambién “tubos de fuego”, principio de las posteriores armas de fuego. Es probable que se usasen globos aerostáticos con aire caliente. Hacia el año 1330 d.C. los árabes hacen un primer estudio para…

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