
I know that the answer to the question "Which of the following is a characteristic of variable capacitors: vacuum between their plates, moving and stationary plates, or plates open to the atmosphere?" is in "Most types of capacitor include a dielectric spacer, which increases their capacitance. These dielectrics are most often insulators. However, low capacitance devices are available with a vacuum between their plates, which allows extremely high voltage operation and low losses. Variable capacitors with their plates open to the atmosphere were commonly used in radio tuning circuits. Later designs use polymer foil dielectric between the moving and stationary plates, with no significant air space between them.". Can you tell me what it is? 


plates open to the atmosphere
