Nguyên tử Cacbon có 6 proton, 6 nơtron và 6 electron. Hỏi khối lượng các electron chiếm bao nhiêu % khối lượng nguyên tử.

b. read the phase at the intersection of any given temperature and pressure.

during expiration the diaphragm relaxes, which causes the diaphragm to move downwards. the contraction of diaphragm increases the space for expansion of lungs. hence, the diaphragm relaxes and positioned downward during expiration.