The hepatitis a virus can best be detained how

You can get a vaccination to help avoid getting Hep A

Also you should avoid food and water that have been touched by people with hep a, because the virus can spread through contaminated foods. Btw, you can also catch the virus from contact with someone with hepatitis a.

also, you should wash your hands often, especially after touching stuff like restaurant bathroom doorknobs, the safety rails on the side of stairs, bubble gum/toy dispensers, office light switch, etc

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.