Can Anyone Explain the Electric Pressure Formula?

[thunderhadron]

Hi, I saw a formula in a book in which I have confusion. Can anyone please suggest me any ref. The formula is as

Electric Pressure = 1/2 ε₀E²

Where ε₀ is electric permittivity of free space and E is the electric field.

 

[sankalpmittal]

Hi, I saw a formula in a book in which I have confusion. Can anyone please suggest me any ref. The formula is as

Electric Pressure = 1/2 ε₀E²

Where ε₀ is electric permittivity of free space and E is the electric field.

Does this help ? :

http://physics.wustl.edu/classes/SP2012/212/lectures/SP11-212-c32.pdf
http://www.ss.ncu.edu.tw/~lyu/lectu...ormat_pdf_html/pdf_1_Ch/lyu_SPP_Chapter_1.pdf