Question

what is respirators and proportion​

Answer 1

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Respirator is a mask or device worn over the nose and mouth to allow somebody to breathe in a place where there is a lot of polluted air.

Answer 2

Respirator ↓

A respirator is a device to protect you from inhaling dangerous substances, such as chemicals and infectious particles.

Examples of these classes of respirators include: Air-purifying respirators (APRs): particulate respirators (also called dust, fume, and mist respirators or masks) chemical cartridge respirators that can have a combination of chemical cartridges, along with a dust pre-filter.

Proportion ↓

Unlike a fraction of a pie, proportion in science and engineering represents relationships between physical quantities. For example, density is a ratio of mass to volume in an object. Understanding ratios as relationships is important to understanding and interpreting scientific data.

or

1 : harmonious relation of parts to each other or to the whole : balance, symmetry.

2a : proper or equal share each did her proportion of the work. b : quota, percentage.

3 : the relation of one part to another or to the whole with respect to magnitude, quantity, or degree : ratio.

4 : size entry 1, dimension.

~hope it helps you my friend:)