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.
A half face particulate (air-purifying) mask is generally worn to protect the wearer from dust and paint fumes. A respirator is a device designed to protect the wearer from inhaling harmful dusts, fumes, vapors, or gases. Respirators come in a wide range of types and sizes used by the military, private industry, and the public. Respirators range from relatively inexpensive single-use, disposable masks to more robust reusable models with replaceable cartridges.