Heart rate is measured by counting the number of beats per minute. Someone's normal heart rate depends on things like the person's age and whether he or she leads an active lifestyle. The resting heart rate decreases as people get older. Typical normal resting heart rate ranges are: 1  babies (birth to 3 months of age): 100â150 beats per minute. 2  kids 1â3 years old: 70â110 beats per minute. 3  kids by age 12: 55â85 beats per minute.
A respirator is a piece of protective respiratory equipment designed to protect the wearer from inhaling harmful particulate matter (as in dusts, including airborne microrganisms), fumes, vapors, or gases.
Particulate respirators: 1  Filter out dusts, fumes and mists. 2  Are usually disposable dust masks or respirators with disposable filters. 3  Must be replaced when they become discolored, damaged, or clogged. 4  Examples: filtering facepiece or elastomeric respirator. Chemical Cartridge/Gas Mask Respirator: Gas masks are also known as air-purifying respirators because they filter or clean chemical gases out of the air as you breathe. This respirator includes a facepiece or mask, and a cartridge or canister. Straps secure the facepiece to the head.