We study the effect on bubble motion of the sudden streamwise expansion of a liquid-filled tube of square cross-section, which is formed by a pair of backward-facing and forward-facing steps. When a bubble of finite volume traveling under constant volume flux reaches the backward-facing step that marks the start of the expansion, the extent to which it broadens to partially fill the expansion d...

children under 3 years of age must not travel in a car or goods vehicle (other than a taxi) unless restrained in the correct child seat. children aged 3 years or over who are under 150 cm in height and weighing less than 36 kilograms must use the correct child seat, booster seat or booster cushion. rearward-facing child car seats must never be used in the front passenger seat of cars with an ac...