Experimental Method to Determine Some Physical Properties in Physics Classes

Revista Brasileira de Ciência do Solo

Luiz Fernando Pires¹  André Maurício Brinatti¹  Sérgio Da Costa Saab¹ 

关键词: particle density;    porous medium density;    gravimetric water content;    volumetric water content;    densidade de partículas;    densidade do meio poroso;    umidade gravimétrica;    umidade volumétrica;   

DOI  :  10.1590/01000683rbcs20140766

来源: SciELO

【 摘 要 】

ABSTRACT Particle density, gravimetric and volumetric water contents and porosity are important basic concepts to characterize porous systems such as soils. This paper presents a proposal of an experimental method to measure these physical properties, applicable in experimental physics classes, in porous media samples consisting of spheres with the same diameter (monodisperse medium) and with different diameters (polydisperse medium). Soil samples are not used given the difficulty of working with this porous medium in laboratories dedicated to teaching basic experimental physics. The paper describes the method to be followed and results of two case studies, one in monodisperse medium and the other in polydisperse medium. The particle density results were very close to theoretical values for lead spheres, whose relative deviation (RD) was -2.9 % and +0.1 % RD for the iron spheres. The RD of porosity was also low: -3.6 % for lead spheres and -1.2 % for iron spheres, in the comparison of procedures – using particle and porous medium densities and saturated volumetric water content – and monodisperse and polydisperse media.

【 授权许可】

CC BY   
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