A visible trail left in the sky by an aircraft and believed by some to consist of chemical or biological agents released as part of a covert operation, rather than the condensed water of a vapour trail. ‘conspiracy theorists have been going wild with speculation over the nature and purpose of chemtrails.
Definition of stratosphere. 1 : the part of the earth’s atmosphere which extends from the top of the troposphere to about 30 miles (50 kilometers) above the surface and in which temperature increases gradually to about 32° F (0° C) and clouds rarely form.
a substance enclosed under pressure and able to be released as a fine spray, typically by means of a propellant gas.