Explanation:

When two elements combine with each other to form a compound, they do so in fixed ratios. These ratios are determined by the number of atoms of each element in the compound. The ratio of the weights of the elements that combine is known as the equivalent weight.

Atomic Heights:
The term "atomic height" is not a recognized term in chemistry. It is likely a typo or a misunderstanding of the question.

Atomic Volumes:
The atomic volume of an element refers to the amount of space occupied by one mole of atoms of that element. It is not related to the ratio of weights of elements that combine with each other.

Equivalent Weight:
The equivalent weight of an element is the weight of that element that reacts or combines with 1 gram equivalent of another element. It is determined by the valency or combining capacity of the element. The equivalent weight is directly related to the ratio of weights of elements that combine with each other.

For example, let's consider the reaction between hydrogen (H) and oxygen (O) to form water (H2O). The equivalent weight of hydrogen is 1 gram, and the equivalent weight of oxygen is 16 grams. This means that 1 gram of hydrogen combines with 16 grams of oxygen to form water. The ratio of weights of hydrogen and oxygen that combine is 1:16.

Molecular Weights:
The molecular weight of an element or compound is the sum of the atomic weights of all the atoms in its formula. It is not directly related to the ratio of weights of elements that combine with each other.

In conclusion, the weight of two elements that combine with each other is in the ratio of their equivalent weights. This ratio is determined by the valency or combining capacity of the elements. The equivalent weight is directly related to the ratio of weights of elements that combine, while atomic volumes and molecular weights are not relevant in this context.