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“When they were born they were so little that I didn’t really notice Hayden’s skin was darker until about three days later. “Unfortunately he’s not in the picture anymore and I’m raising the twins on my own. “Hayden is darker skinned like my ex-partner, he’s African American. Mum-of-three Amy, a veterinary technician, said: “Holden has blonde hair and fair skin like me – I think my family is mostly of Scandinavian and German descent. The boys, who were born prematurely at 29 weeks, attract attention everywhere they go, and people find it hard to believe that they are even related. Hayden (LEFT) and Holden (blond hair and blue eyes) Keller might be twin brothers – but they couldn’t be further from identical, having inherited different skin tones from their mixed-race parents. While Holden Keller inherited blonde hair and blue eyes from his mum Amy Keller, 36, his brother Hayden got darker skin and brown locks from his African-American dad.Īmy, who is raising the 15-month-old fraternal twins on her own, was told she was expecting identical twins during her pregnancy as the babies were sharing a placenta.īut when the babies were born just seven minutes apart in December 2016, it became clear that they were far from identical. * Thermal conductivity (1.013 bar and 0 ☌ (32 ☏)) : 24.24 mW/(m.These mixed-race boys are actually TWINS – despite the fact one has dark skin and the other is white. * Heat capacity at constant volume (Cv) (1 bar and 25 ☌ (77 ☏)) : 0.021 kJ/(mol.K) * Heat capacity at constant pressure (Cp) (1 bar and 25 ☌ (77 ☏)) : 0.029 kJ/(mol.K) * Gas density (1.013 bar at boiling point) : 4.475 kg/m3 * Gas density (1.013 bar at boiling point) : 4.614 kg/m3 Statistics for N2 and O2 if you guys wanna run the numbers yourselves: obviously a race engineer would want to remove as many variables as possible and this is certainly one of them you can calculate about 13% less change in volume. oxygen the volume due to temperature changes would be significantly less. using the PV=nRT equations tells us that because of the molar weight difference of nitrogen vs. so a humid race in the southeast united states or a dry race in the desert western united states could make for unpredictable tire pressures if "dry" nitrogen were not used. water causes air to be inconsistent in its rate of expansion and contraction. nitrogen pressure is more consistent than normal air pressure because air typically contains varying amounts of moisture due to changes in the relative humidity on race day.
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with track and tire temperatures varying over the duration of a race the consistency of nitrogen is needed. often a half pound of pressure will radically affect traction and handling.
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Many race teams use nitrogen instead of air in their tires because nitrogen has a much more consistent rate of expansion and contraction compared to the usual air.