The refrigerant gas is then compressed to a higher pressure by a compressor or a generator, converted back into a liquid by rejecting heat through a condenser and then expanded to a low-pressure mixture of liquid and vapor that goes back to the evaporator section. The cycle is repeated.
You should tip a taxi driver around 10% of your taxi fare. The taxi driver should usually help you load and unload the bags. When you approach the airport, there are porters, called skycaps, who can help with the bags. You should tip them $1 or $2 per bag. You do not tip the flight attendant, employees at the ticket counter, etc. If you need wheelchair assistance, you should tip at least $5 per passenger. At other places like a rental car center, you should generally tip $1 or $2 to whoever helps you with your bags. When you reach the hotel, you should tip $1 or $2 per bag to the bellboy or doorman who handles your bags.
Tip the concierge for getting you a cab $5 to $10, depending on the amount of time he spends with you -- helping with restaurant reservations, hailing you a cab or finding discounted theater tickets. And donât forget the shuttle bus driver, parking attendant and room service.