A
Which property of a gas affects the rate at which it spreads throughout
laboratory?

Diffusion is faster at higher temperatures because the gas molecules have greater kinetic energy. Effusion refers to the movement of gas particles through a small hole. Graham's Law states that the effusion rate of a gas is inversely proportional to the square root of the mass of its particles

Explanation:

When we perform any experiment then it is advised to strictly follow the instruction in order to avoid any accident or mishappening in the laboratory.

Hence, when heating a test tube it is safe to remove the dangling bracelet because it is possible that the bracelet might pull over the test tube.

And, this may lead to spilling the reagent or acid present in the test tube.

Therefore, it may cause an accident in laboratory.

That is why, it is advised to remove a dangling bracelet when heating test tubes of acidic solutions in a hot-water bath in a chemistry lab.