What type of porosity occurs when gases dissolved in molten metals are released during cooling?

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Porosity caused by metal contractionPorosity due to trapped gas bubblesPorosity from uneven metal solidificationPorosity formed by tiny voidsPorosity related to surface defects

Explanation

When gases dissolved in molten metal are released as the metal cools and solidifies, they form pores known as gas inclusion porosity. This differs from other types such as suckback porosity, which is caused by metal shrinkage, localized shrinkage porosity from uneven solidification, and microporosity which involves very small voids.