在物理学中很多物理量之间存在着一定的相互关系,这些物理量之间的相互关系以及很多的物理规律往往可以用一个数学式子简单、直观地表达出来,这个数学式子就是物理公式.很多物理公式常常又表现为一个分数式,如I=U/R、C=Q/U、E=F/q、p=F/S、v=s/t、a=F/m、q=Q/m、ρ=m/V、E=U/d、P=W/t、I=q/t等等.这些形如a=b/c的式子按纯数学的意义来看,可以说a与b成正比,a与c成反比.然而物理公式中的物理量有其独特的物理 There is a certain relationship between many physical quantities in physics. The interrelationships and many physical laws of these physical quantities can often be expressed simply and intuitively by a mathematical formula, which is a physical formula. Many The physical formulas are often expressed as a fractional formula, such as I = U / R, C = Q / U, E = F / q, p = F / S, v = s / t, a = F / m, q = Q / m, ρ = m / V, E = U / d, P = W / t, I = q / t, etc. The expressions of the form a = b / c are purely mathematical in meaning a is proportional to b, a is inversely proportional to c, whereas the physical quantities in physical formulas have their own unique physical