Kirchhoff's law of thermal radiation rarefied material such as air, or transparent material, through which observations can be made. The interface is not a material body and can neither emit nor absorb. It is a mathematical surface belonging jointly to the two media that touch it. It is the site of refraction of radiation that penetrates it and of reflection of radiation that does not. As such it obeys the Helmholtz reciprocity principle. The opaque body is considered to have a material interior that absorbs all and scatters or transmits none of the radiation that reaches it through refraction at the interface. In this sense
Sound of a Woman becoming the third-fastest selling single of 2014 in the United Kingdom. "Giant in My Heart" was released as the album's second single on 13 June 2014. It reached number 4 on the UK Singles Chart. "No Enemiesz" was released as the album's third single on 23 November 2014. The official music video was released a month earlier on 24 October 2014. "Sound of a Woman" was released as the album's fourth single on 24 May 2015. "Cut Me Loose" (SeeB remix) was released as the albums fifth and final single on 21 August 2015. "Sound of a Woman" received generally