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.
This shows the valet that you appreciate their efforts and they, therefore, will show respect to your car. Valet Parking Tipping is usually around $2 for each time the valet parks or retrieves your car if there is no parking fee. Now, if there is a parking fee that does not mean that the valet should not get a tip. In fact, the higher the parking fee, the bigger the tip the valet should receive. For example, if parking costs $5, the tip to the valet can still be $2. However, if the parking charge is $10, the valet should be tipped $3; if the parking charge is $15, the valet should be tipped $4; and if the parking charge is $20, the valet should be tipped $5.