NaCl, when you combine sodium and chlorine
I think it’s the frequency? Because it lower his voice when he whistle again
Warm is less heaver then cold air so warm air rise and cold air sinks
Because of London dispersion forces.
Charles law states that volume of gas is directly proportional to temperature of gas at constant pressure and fixed amount of gas.
V / T = k
where V - volume , T - temperature in Kelvin and k - constant

where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
T1 = 25 °C + 273 = 298 K
T2 = 35 °C + 273 = 308 K
substituting values in the equation,

V = 5.17 L
new volume is 5.17 L