After the French GP, Red Bull presented a very strong pace on the straights, surprising Mercedes, the same happened in Austria, the team led by Toto Wolff responded at Silverstone, with an increase in the performance of their cars on the straights.
For Red Bull and Ferrari, the increase in acceleration of the two Mercedes cars, especially when exiting slow corners and at the beginning of straights, comes from the introduction of cold air, with temperatures below those permitted by regulation. Compressed air is normally cooled from 100 degrees to ambient temperature, but the rules give a leeway, with the lower limit being 10 degrees below the outside temperature. The two teams suspect that Mercedes may have placed the sensor at a point that measures temperatures within the limits established by the rules, but manages to introduce cooler air than regulated, gaining up to 20 hp of power for brief moments. These suspicions led Red Bull to ask the FIA for an explanation on this matter.
Source: with agencies