Relative humidity is the amount of water the air can hold at a given temperature. For example, an RH of 50% means that the air is holding 50% of the moisture it can possibly contain at that temperature. Once the RH gets over 100%, it rains.
The term remuneration in general means compensation or pay. The term pay is more commonly used that remuneration or compensation. Remuneration also has a broader meaning as base salary or pay plus bonuses, commissions, and other payments or benefits paid to an employee under the terms of a contract.
In general, Forms I-9 are not required for unpaid individuals unless the individuals will receive something of value in exchange for their labor or services, also referred to as remuneration. Remuneration can come in many forms, such as money, meals, lodging and other benefits, but does not include gifts.