Chlorine dioxide (ClO 2) is a gas that can be used for water disinfection. To date, only uncut and unpeeled produce can be contacted with ClO 2. Chlorine dioxide has been given a USDA 3-D approval for washing fruits and vegetables to be used as ingredients of meat and poultry products.he chemicals that make up chlorine dioxide can also be easily identified by the user. Sodium chlorite is a white crystalline powder. One of its physical characteristics is its ability to absorb moisture. The other component of chlorine dioxide, hydrochloric acid, is a colorless liquid.
The validity of a test refers to whether the test measures what it is supposed to measure. The three most common types of validity are face validity, empirical validity, and construct validity. We consider these types of validity below.
Validity is the extent to which a measurement tool measures what it is supposed to measure. Psychologists need high validity on the assessments they use so that they know they are studying what they are trying to study.