Ringer's solution is named after Sydney Ringer, who in 1882 1885 determined that a solution perfusing a frog's heart must contain sodium, potassium and calcium salts in a definite proportion if the heart is to be kept beating for long.
12.
The produce was divisible in certain definite proportions, which obviously must have varied with the varying fertility of the soil and other circumstances and did in practice vary so much that the landlord's share was sometimes as much as two-thirds, sometimes as little as one-third.
13.
Stoichiometry rests upon the very basic laws that help to understand it better, i . e ., law of conservation of mass, the law of definite proportions ( i . e ., the law of constant composition ), the law of multiple proportions and the law of reciprocal proportions.
14.
French chemist Joseph Proust proposed the law of definite proportions, which states that elements always combine in small, whole number ratios to form compounds, based on several experiments conducted between 1797 and 1804 Along with the law of multiple proportions, the law of definite proportions forms the basis of stoichiometry.
15.
French chemist Joseph Proust proposed the law of definite proportions, which states that elements always combine in small, whole number ratios to form compounds, based on several experiments conducted between 1797 and 1804 Along with the law of multiple proportions, the law of definite proportions forms the basis of stoichiometry.
16.
The law of definite proportions contributed to, and was placed on a firm theoretical basis by, the atomic theory that John Dalton promoted beginning in 1803, which explained matter as consisting of discrete atoms, that there was one type of atom for each element, and that the compounds were made of combinations of different types of atoms in fixed proportions.
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