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Starting with a constant mass of a gas, with a fixed volume, change the temperature, the pressure tracks according to specific parameters. That’s Boyle’s Law, Charles’ Law, and Gay-Lussac’s Law. Simple, really. You can complicate it hugely when you start dealing with a gas that changes states with temperature, like water for steam. Then you get into steam tables, where you start dealing with the Rankine cycle. When you flip that light switch on, the light comes on because of what we know about this stuff.”His mouth opened slightly. “And internal combustion engines?”I smiled. I’ve got ‘im. “Chemistry is still there in combustion byproducts produced by the interaction of hydrocarbons with ambient air. A given volume of air contains a known amount of oxygen and other gases. The oxygen, which we know, interacts with the hydrocarbons, which we know, producing heat as well as gases – carbon monoxide, carbon dioxide, oxidized nitrogen compounds...”“Okay, you got me...”“The idea,” I said. "So, how my sisters doing?" Heather enquired. "You pleased with them so far?"Matthew battled to staunch a chuckle. "Mmm, yes they're absolutely perfect...and they're brightening up the place nicely too." They not, um, bother you at all, Matthew?" Bother me?" he countered knowingly, sensing her disquiet."Well you know what young girls are like." Oh I think I can handle a little flirting."Heather was dumbstruck. Matthew's eyes returned to the screen where Tia had pushed her sister up against the wall and had ripped off her bra. Heather's voice rang out in his ear, but he wasn't really listening. He was busy reaching inside the zipfly and fishing out an extremely hard cock. Giving it a gentle stroke, whilst maintaining eye contact with the screen, it felt so good in his palm. Yet it would feel even better inside Heather's tight pussy, he thought. He had a good mind to get down to the office now and fuck her senseless. He moaned in appreciation as the foreskin stretched back and.
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