I'm building a pizza oven and, to do so, I bought a whole load of engineering bricks (not these but similar). They've got five holes vertically through them, each hole is 2x6x6.5 cm (80 ml) and the walls, both end and dividing, are 2 cm thick by 6.5 cm high.
When the oven is fired up it will reach ~500 °C. If we use some good solid concrete as masonry for the bricks, which will seal the ends of the holes, I'm worried that as the air heats up, the pressure inside will turn them into a sort of ceramic bomb that will make cooking pizza a rather more exciting experience.
Is that likely to happen? How can I calculate the pressure that will be exerted on the bricks by 80 ml of air at 500 °C?