Chemical Process
Systemic insecticides

Are absorbed throughout the plant
Emit poisonous vapour
Kill insects following external bodily contact
Are stomach poisons

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Chemical Process
Liquefaction of gases can not be done by

Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Adiabatic expansion against a piston or in a turbine
Merely compressing it beyond critical pressure
Exchange of heat with colder stream

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